Music Reference RM Mono?

I am using an RM10 MKII (35 watts) with my Merlin VSMs (89db, smooth, high impedance)in an 18x12 ft room. Listen to jazz at moderate listening levels (I think)- it plays plenty loud with 35 watts. I was wondering if I would get any significant improvement by buying another and running them as monoblocks with 70 watts given the type of music I listen to and the size of my room. Any Music Reference lovers try the monoblock congifuration? Better? In what way? I'm think another 3db is volume isn't going to make any difference to me, but....