Is it possible my room sounds better without DSP
DSP is limited in what it can do. If you post your measurements there will be a before and after graph and we can discuss.
I use fib ratios for placing seats, placing panels, not really for equipment.
The HST speakers place the woofer on the back, about 2 inches from the wall, facing it. Two tweeters angled out at left and right directions. It worked better for my room than traditional on walls.