>>What about a second set of M50s for you as "B" speakers setting them side by side!!! 4 Woofers & 2 Tweeters on each side!!

Not side by side... second pair inverted on the first pair for better imaging

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8