Psvane CV181 TII in both driver and splitter on VAC Renaissance 70/70?

Hi everyone, I dropped a pair of Psvane into my VAC ren 70/70 in the splitter sockets, and I love the improved sound.  I currently have EH in the driver sockets, and I'm considering getting another pair of Psvane to drop in there.

Problem is they're a bit pricey, and not available at the snap of a finger.   

The other issue, I've seen people say a mixed setup - one kind of tube for splitting and one for output, will yield a better sound than using the same tube for everything.  Some idea of cancelling out weaknesses vs accentuting them I think.

Anyway, I'd love to hear any thoughts on this.  The improvement from the Psvanes was enough that I'd like to see what I get.

Thanks!