Map1: You mention that you are bi-wiring and jumpering between the top and bottom, this could be dangerous to your amp, remove the jumpers when you bi-wire.
My friend bi-amped his VR4's with a tubes on the top end and SS amp on the bottom and they were extremely bass heavy because without using an active crossover the amps have different input sensitivity and watt ratings which causes them to ramp up at different volumn levels... what makes things worse with the VR's is the top and bottom have different impedences so that also causes the Solid state amp to double in watts making the the disparity even worse.. So look at getting a Bryston active crossover or something to allow the matching or just do what he did and get a Parasound JC-1 (and make sure to break them in 1400hrs to hear what they are capable)
I actually brought over my Music Reference RM200 over and we bi-wired it to the 8ohm taps (sounded more dynamic than the 4ohm taps) It was pretty amazing the control and the bass it had but the room wasn't as big as yours. The RM200 is an amazing amp but if you are a crank it fan, you can't go wrong with the JC-1's output, and then make sure to put a transparent tube preamp in front of it to get an excellent combo. My friend uses an ARC LS25 preamp. Or try a Rowland Synergy IIi (which is what I use and we tried at his place)
My friend bi-amped his VR4's with a tubes on the top end and SS amp on the bottom and they were extremely bass heavy because without using an active crossover the amps have different input sensitivity and watt ratings which causes them to ramp up at different volumn levels... what makes things worse with the VR's is the top and bottom have different impedences so that also causes the Solid state amp to double in watts making the the disparity even worse.. So look at getting a Bryston active crossover or something to allow the matching or just do what he did and get a Parasound JC-1 (and make sure to break them in 1400hrs to hear what they are capable)
I actually brought over my Music Reference RM200 over and we bi-wired it to the 8ohm taps (sounded more dynamic than the 4ohm taps) It was pretty amazing the control and the bass it had but the room wasn't as big as yours. The RM200 is an amazing amp but if you are a crank it fan, you can't go wrong with the JC-1's output, and then make sure to put a transparent tube preamp in front of it to get an excellent combo. My friend uses an ARC LS25 preamp. Or try a Rowland Synergy IIi (which is what I use and we tried at his place)