justanoldmuso,
Thanks for your time. Actually I have tried this method of running things from 2 ssd's simultaneously, before posting this thread smile

I tried running program on one / RT on the other, Program+RTs on one and VST on the second.

There seems to be a particular issue with Sonic + BIAB combination in my case. Andrew posted couple of possible solutions which I will try next week. What is strange that Sonic has all those adjustments to lighten the load on CPU and none of them seem to have any effect.

Will post back if Andew's method will solve this.