Hello again, djronh1...

Your Rane MLM 42S and L1 form a really compact and versatile rig for intimate events. Top quality gear throughout !

To business: ...I'll deal with the the latter issue (and possibly the more serious, given the history of your recent cash outlay) first. A couple of thoughts:

1. The "price paid" for the WiFi "friendliness" and the two extra channels of the RF2 scheme is that it's inherently less robust than RF1 and
2. It seems to me that there was probably WiFi or Bluetooth interference on the "Groom frequency".

As I never use more than nine channels, I've taken to almost always using RF1 by dint of resolving (very rare) WiFi and Bluetooth issues through physical separation. "Bluetoothers" and "WiFiers" seem to blog on quite happily when they're more than a yard (metre) or so away from my transmitters. Equally, they don't bother me, so long as they are at least a yard (metre) away from my receiving antennae.

You're probably doing all of what I'm about to suggest anyway, but it's best if you can have both P180 paddles "seeing" the transmitters' "performance area" from different angles. In other words one from "in front" or "behind" the performers, with its "mate" picking up from one or other "side", ...one also being handspan or so higher than the other. This helps maintain RF "line of sight" around human bodies and other RF absorbers or reflectors.

Please excuse my repeating that, unlike the "log periodic" paddles of other makers' systems, which have their "spines" aimed ("rifle-style") at the transmitters, Line 6's P180 "patch" arrays must have their "flat plate" sides (opposite the cable-compensating "Gain" switch) facing the "performance area".

Upgrading the software has given you access to the "expanding ears" RF measurement display around the letters "A" and "B" on the main screen of your receivers. These indicate the actual signal being captured by their respective antennae and greatly help the optimisation of antenna locations for solid coverage.

Also, I tend to do a quick receiver check of the "Set Up/Function 2/Channel Scan" screen before each gig so as to be aware of any RF that may have just "walked in".

In my experience, RF1 has been pretty much "bulletproof", with typically well over a hundred metres (300ft) of trouble-free range at high transmitter power. By far the majority of my work is performed with XDV transmitters on the "Battery Saver" lower power setting.

Now, wind noise is an entirely different challenge.

I know of NO directional lavalier that performs well in this regard. Omnis perform much better, but are useless for what you and I do ...as there's no way we can achieve sufficient gain before feedback.

Spend a few hundred bucks on a top-quality directional lavalier and all you may achieve is a marginal improvement in handling noise and/or the "open-ness" of high frequencies, ...with the same horrible racket from breeze blasting the "back-rejecting" ports on the body of the mic, just like it does with Line 6's.

The best results I've had in this regard have involved very few dollars indeed. I simply stretch a second, bulkier "foamy" over the one included with Line 6's lavalier. Something like these:

http://www.amazon.com/Pearstone-Windscreens-Diameter-Microphones-Black/dp/B0065KYGJ0/ref=sr_1_47?ie=UTF8&qid=1339980852&sr=8-47&keywords=lavalier+windscreen

Don't bother spending more money (a lot more) on expensive "furry" screens such as those I have from Rode and Rycote. For this application, they seem to yield almost no improvement over my "double foamy" arrangement. (They have, however, proved fabulous for recording with omnidirectional lavaliers.)

Given that back-port wind racket is inevitable with directional lavaliers, maybe it's time for some good news.

A little while ago I successfully PA'd a gusty gathering with my "double-foamied" Line 6 lavaliers, ...the only untoward audio artefact being a slight "raspy" wind-induced "gargle" from gusts just short of being strong enough to knock the participants off their feet.

All commented on the clarity with which proceedings were heard, without a single reference being made to wind noise. As their origin was only too obvious, the minor audio blemishes caused no distress whatsoever, unlike the loss of hats, flowers and pretty much anything that wasn't tightly secured.

(I believe they're still looking for one of the lighter guests...) 

How? ...Well, as you suspected:

1. I first engaged the harshest "SF6" speech filter in my TBP12's,
2. Then used a "dummy run" to set equalisation and gain before feedback ...then finally
3. I set the "Dynamic Filters" of my receivers to "TALK", which in turn prompted the use of a bit more gain.

Some additional improvement may (hypothetically) be possible via headworn mics, but the very nature of the event I'm talking about (and probably yours) pretty much rules out personal intrusion to that extent.

From my point of view, (and more importantly, that of my clients) this great outcome would have either been altogether unattainable or prohibitively expensive ...without the benefit of Line 6's inbuilt processing.

I know of no other wireless gear that has anything like it.