Should i cross speakers over to "small"?

A different angle...
With all the speakers reproducing full range bass, woofers are in many places in the room. Standing waves and cancellations you didn't plan on may become evident. With all the bass coming from one location (the Sub) it's possible more locations in the room would sound better (instead of one sweet spot) Experimentation may bear this out. If all your speakers are indeed capable of reproducing down to 20Hz it could very well be an issue. It's even tricky with multiple subwoofers.
Rich.

THX and almost ever professional group in HT recommend setting all speakers to small. Only in rare instances do we set the mains to large for HT.

The Answer is "experiment"

Your speakers are full range speakers with active 12" subs built in, correct? You should be able to get very good results crossing these over lower than 80hz. Because of the effieciency of your bass system here, You should probably try to cross lower. Yes, experiment and see. You may find they're very powerful and dynamic even full range, set to "large". If your receiver selects at different freq's, like 40,50,65hz, etc, you should try those. I would.

so far have set all surrounds to "small". noticed a huge improvement. Now looking at Adcom 7607 7ch to use w the Yamaha, waiting for local dealer to return call to see if will match up well w the receiver