So I went in and changed the amp to Y and hooked it up as mentioned.. I left the gains the same, and I have to say- I am getting more out of them.. Maybe in my head but man they sound better then they did in "stereo"
Thanks a bunch guys!!!!!
Also, try setting the subs up all together rather than "left-right". The L/R setup is suitable if you need to spread the low end over a wide area.
If possible, try them in a row end to end in front of the stage or dance floor or stack pairs end to end.
This couples them together and it makes a difference.
I have used 16 TH115s stacked in pairs and end to end in front of the stage.