Distance from the front wall for magnepan mg 20.7

Would like to call out any maggie 20 series owners on how you have positioned your speakers from the front wall? Mine is 6.5feet out and 7 feet apart in my 17.5ft x 27ft room. Im sitting 11.5 ft away from the speakers. Ceiling height 8.5ft. Would like to maximize bass output without sacrificing imaging and depth. Have experimented a lot but would like to hear on actual user experiences.

I have read the cardas room placement suggestions and other basic positioning.

Also does the maggies prefer a dead silent front wall, diffused/absorbent combo or just do minimal damping?

Thanks for the replies...