Psvane KT88 tubes in VAC amps

I've retracted my Psvane endorsement as one of my 12Ax7TII tubes failed and made me sad. It will take a while to recover.

i used treasure tubes from shuguang in my vac 450 and did better with the shuguang sc from kevin

I read through this topic, , there is no real bonifide , fair , through, unbiased, review of how the P KT88's acutally respond in a amp, for fq resolution, vocals, bass guitar lines, snare drum, etc. Nada,,,looks like i will have to purchase 6 for one channel in the Defy 7. 
= late 2020. 
I am using Shu 1990's production of a  88 designed for ARC, 
Clean, smooth, bass, but have not heard any others so its impossible to say, how great/poor this 88 really is , 
I mean to say, there is no smokiness/muddyness/no distortion with these 88's, 
Will the Psvane offer more dynamics/soundstage etc ?
Buying for 1 channel only. 
btw IMHO the KT88 is the superior power tube to own,. 
Shoots out the KT90, EL34.
I wonder how the 88 performs vs the 120/150;'s??
For my needs there is only 1 choice = 88's.  120/150's are overkill for my small room.