What tube amp are you using with Von Schweikert VR series speakers

I bi-amped my VR4 genIIIs using a TAD 60 on the top, B&K M200’s on the bass. This sounded quite nice. I ran the TAD in triode mode (30watts). Running the TAD full range left me with some flabby bass evening ultralinear mode (50 watts).

dpm2340

They may be out of your budget, even used, but I think you owe it to yourself to hear these speakers with OTL tube amps. The Atma-sphere M-60 might do the job. (or at least the MA-1). I find that OTL has a clarity, timbre, immediacy etc that overrides other considerations - to my ear (triode might be even better, but that wont work with your speakers). Whatever you do, get a deal where you can try the amp in your room and with your speakers before final decision. 

I've used a Conrad Johnson Classic 120SE with great synergy driving my VR7HSE

May I ask what pre you were using at that time?

I own a pair of VR4jr for 13 years. They seems to run best for me biamped with the bass units driven by solid state and the top unit with a separate amp. Are you using the factory jumpers between the top and bottom units?  The biggest sound improvement for me was to avoid the jumper.