…not all stereo effects are mono-compatible
This is important.
When it sums to mono - it can sound *bad*.
The other thing is - you need to identify what’s causing the issue. My method would be to pull everything out of the signal except the amp and cab.
Does it *ever* come forward?
Then start adding and removing one thing at a time. No smoking gun?
Start adding two things. All the variations. Then 3….etc.
Time consuming? Yep. If it finds the culprit, good. If it doesn’t - then a whole new rig may be necessary.
Being a quality commercial rig or profile doesn’t matter. It can still suck for what you want. Just don’t assume that because the maker is trusted or highly regarded means it’s something you did or didn’t do.
Paid profiles/rigs can suck just as easily as any other.