If you can drive them very loud the addition of the M2200s is probably not the solution to the issue. At most, it would provide 3 db more SPL at max output. I do not think your Classe is the issue. Moving the 703s around is likely the solution along with playing with the plugs. I did notice in a review that the 703 uses a diffent type of seal ring around its midrange which you might want to inspect closely. I doubt if that is a problem but since it is different I would look at it.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner