Ayre V-5xe best tube pre-amp to match with?

So, here we are. After comparing HP-100 to VK-31 SE and Pass X-1, X 2.5 and Rowland Synergy II i I ended up buying Ayre K-5xe and added several modifications. The result is amazing !! US $ 900,00 for mods turns the already impressive K-5xe into a giant killer. Leaves X-1 and X 2.5 as Synergy II i (last two previous units in my chain) far behind. Musically more involving + added speed, transparency and detail compared to VK 31 SE. HP-100 nice, very appealing but not as a partner for V-5xe.
Next higher level was Nagra PL-L (GREAT), CAT SL-1 Ultimate MK II and Ayre K-1xe (all great units) but a) to expensive for me and b) the difference is not that huge to pay twice the money.

I am taking delivery of the Ayre C5XE, V5SE and K5SE next week and I'm curious what mods you were able to make to the preamp to provide this improvement. Would you please share this info? Thanks.

The following mods were done to V-5xe and K-5xe:

adding of damping material (case work); set of three Stillpoint Universal Resonance Dampers underneath each unit; one Shakti Stone on top of the V-5xe; replaced the cheap fuses with high-quality gold-silver ceramique fuses; replaced power inlet with a high-quality cryo treated gold-silver one; use of Walker E-SST on all contacts (fuse contacts as well); replacement of Diodes, etc. with highest quality parts; taping of the cooling device of the V-5xe (tip from Chrles Hansen) - total amount for the K-5xe US $ 900,00.

Hi Frankpiet,

>> taping of the cooling device of the V-5xe (tip from
>> Chrles Hansen)

I didn't quite understand this part. Can you please elaborate? Thanks!

Charles gave me the tip to reduce internal vibration of the V-5xe cooling device to tape it with a clear cellofane.