Gold or Platinum Grade of Tubes for BAT Preamp.

Hi, all. I am awaiting delivery of my BAT VK-33. I’m going to replace the 6 stock EH 6922s with the NOS Rocket Logo 6H23-EB, which is a direct replacement for the 6922. My tube vendor has gold grade or platinum grade (which is about $15 more per tube than the gold grade). Tolerances for matched gold grade are 15-20%, while the platinum tolerances are 10% or less. Given that these are small signal tubes, is the tighter tolerance of the platinium grade worth the $$? Is the BAT hard on tubes, thereby requiring the more expensive ones? Thanks for your help.
I was under the impression that BAT uses the 6H30 preamp tubes. 
@stereo5 ... the VK-33 appears to be the last of the current BAT preamps to use the 6922. The "SE" version uses the 6H30, and I think all other BAT preamps now are using the 6H30. The VK-33 has been discontinued recently, so I got a decent, discounted deal on a BNIB model and have the ability to tube roll.
Buy the best your budget allows. Why do anything else? 
6n23p-ev is not the same tube as 6n23p, or e88cc/6922, though interchangable it behaves more like an e188cc with less dynamics, due to much lower cathode resistance that will draw too much current in a 6922 circuit, if you want that.
Life expectancy same as 6n23p.
I would use platinum matched in a phono stage and gold in line.

@petg60 ... Victor from BAT told me that the 6H30 is a direct replacement for the 6922.