I'll add my own "qualification" to my first response. I sincerely hope your health concerns improve, and at least don't impact your ability to enjoy your rig.
Frankly speaking, the first response was indeed the correct one - and good advice; lacking the knowledge that experimenting isn't practical. It sounds like you are now receiving guidance from folks experienced with your amps.
Further, no apologies needed for the "old man ploy" as many of us audiophiles are nearly there if not exactly there. I've instructed my kids that when my age prevents me from other activities they should park me in from of my rig with a remote and I'll be happy. It's the great thing about music.
Happy listening!
