I have had the Prima Luna PL2 integrated and PL5 power amp for the last 10 years. These amps are truly wonderful ... great detail, musical, just a touch of warmth, easy to tube roll. But they do run out of steam.
When I playback a movie (blu-ray) in the PL2 system which is connected to Omega MK7 high efficiency monitors, the system gasses out when I try to go too loud. Now granted, the Omegas as single driver monitors will only play so loud, but the PL2 does gas out. I live in an apartment and mind the noise house rules. The listening space for the PL2 is 10X15X8. The room is carpeted and the windows draped.
I do not know the ML Vantage speakers that you own. I have never owned MLs. Without knowing how loud you listen, I would think though that they would require more power than 36wpc.