Ben PM'd me about the pairing a couple of weeks ago, I indicated to him that the Bottlehead may not put out enough power for the V2s due to their lower sensitivity (than the V1s). I was also basing this on a report from Tyson and Pez that Pez's 8 watt SET wasn't enough to drive the V2's adequately.
Ben, you may want to PM Tyson and see what he has to say. I would also recommend posting your question on the GR Research circle, you will likely get more opinions from V2 owners there.
Good luck with your search!
Best,
Ed