Re speaker width try moving you speakers about one foot each toward the side walls and then cant (toe in) the speakers until the axis of your speakers cross in front of your listening position. Obviously it helps like hell if you can deaden the first reflection points but it is not as critical with the severe toe in. Also, I don't recall seeing you comment about the location of your listening chair, but it would probably be best located about 8 to 9 feet from the plane of the speakers (if aesthetics allow :-).
Upgrading from Primaluna
Recently went down the front end upgrade path and am running a nice table and phono now. I'm curious as to what the weaker link in my system is between my Primaluna Dialogue Premium Preamp and my Dialogue Premium Hp Power Amp. I'm considering swapping out the amp to a Ps Audio BHK250 for the summer to avoid heat, but am curious if I would be better off dealing with the heat and moving up to say an Allnic L-7000/Arc Ref 3 for the Pre. I'm happy with tubes on the front end, but curious if I'm running out of gas with 88DB efficient speakers and a single chassis tube amp. Which amp would you upgrade first and what benefits would you expect?