First of all I apologize for my english ....
I'm Italian, if we're on simple concepts usually I have no problems, but if the subject is complicated, I might make mistakes
so excuse me for this .....
I almost agree with you ... almost, indeed ....
Without going too far, if you only need to prove the functionality of Helix, just use
Factory 1 - 1A Us Double Nrm
and already you feel if it sounds good or bad.
Not that you like or not like that tone ..... especially if you use good headphones to monitor ..... I use Beyerdynamics too
I'd like to listen to a record made with this patch .... well, just to see "how" it sounds bad .....
If you help someone understand if it's a hardware problem, I think you have to start from a common point (a Factory preset is a good starting point for me), you must only ensure that the output volume is not saturated (and any sound card allows you to verify it), because the gains of the individual blocks are already ok (the reason to use a factory patch), and the overall volume set at noon is not a reliable judge.... use a vu-meter....
record a short audio track and publish it on the forum, so other users can understand and judge it by ear which may be the problem
Usually I follow the KISS rule
No CustomTone Patch for testing (avoid mistakes made by other users)
No third-party IR for testing (possible gain match problems )
Possibly exclude all effects.....even Reverbs
Because variables only increase in number
For the rest, someone said to cut the frequencies of the CAB or IR, or adjust the global eq, I said my opinion about the frequencies cut...
And for the record, I have many doubts even about adjusting the global eq ....
if I'm not mistaken we are talking about headphone monitoring.....