Just found out that the amp and cab parameters are not being transferred in up and down load. It may take a few days cause I don't have much time right now, but I will try to get to your tone and find out what I had parameters set to.
For now here's what you can tweak for yourself.
Master at 100% allows the amp to be fully distorted. So if it is set to 50% it will lessen the over all amount of distortion the amp on its own will have. I really like to use the each amps own drive/distortion before adding a pedal. If I want the clean sound I store the amp clean on a separate patch. Many times I'll have sort of an A/B box thing going on. Same amp one patch clean the other fully driven.
SAG does what it sounds like. It sags the signal, or it flexes. I put it on 100% most of the time with Fender amps. I also pull it back to 0% for clean tones like pink Floyd. On 0% every little nuance is instantly transferred to the speakers. Running it to 100% allows the flex, or SAG to happen. Springy spongy sound. I use this many times to get the brown sound for Van Halen tone.
HUM just adds the hum sound. I don't use it very often. I usually leave it on 50% or less for all my tones.
Bias I love this one. If I am trying to get the fender tone I put it on 100%. To me it breaks up less, just like 6L6's compared to EL34's. So to get that tone you guessed it, I put it on 0%. Now for the older plexie I guess you could put it on 100%. Try it.
Bias X I haven't figured out yet. So for now I turn it to 100% or 0% which ever sounds the best.
Cab's I set the the
Low cut to 0% so it gets a real beefy tone. You are getting all the bass that the amp and cab produce.
Res level I'v been setting to 100%. It makes the cab louder which makes the cabs tone show up.
Thump I set at 50% because it does the same thing, It brings out some of the cab characteristics.
Decay I set on 0% unless I want a flangey sound. In reality this is probably 0.01 to 0.50 millisecond delay.
So if the amp tone you're looking for is a clean sound set the master back towards 50% i.e (50% or less), set the sag towards 0% Bias towards i.e (50% or more) or on 100% Bias X on 100%.
If you are looking for heavy distortion set the master on 100% sag at 0% bias towards 0% (50% or less)
Bias X towards 0% (50% or less)