Chuck, just to make sure...your speakers are 1007 Be, correct? I had 1008 Be and felt the bass was a little lacking in my 18x25 room. So I moved up to 1028 Be and still find XA30.5 drives these 3-way floorstanders without a sweat (meter stays on the left side even at very loud level).
One other thing to note is when I had 1008s, at one point I did A/B XA30.5 with Bryston 4BSST2 (300wpc) and didn't feel Pass gave up anything to Bryston in any way. Bryston may drive a lot more difficult load better, but for speakers like 1008s, my experience is Pass is in another league.