Can the top end of a PrimaLuna Evo integrated be tamed w/tube rolling?


This weekend I have a PrimaLuna Evo 3 as a house guest to compare with my Supernait 3 solid state integrated. Both are about the same price, basically tube vs solid state. I am a big fan of the Naim PRaT but I also find the depth and transparency of tubes very engaging. The Evo integrated on its own lacks the rhythm and pace of the Naim but it does have transparency and imaging in spades.

So the idea is maybe run an Evo 3 preamp instead along with a Naim 250 (or just use the amp section of the Supernait).

But one problem I cannot get over is that there is a very fatiguing high end to the Evo 3. Cymbals, snare drums, top edge of distorted guitars, etc are pretty harsh at any volume higher than background music. To compare, my vintage Luxman valve preamp into the SN3 does not have this quality (but it lacks the refinement of the PrimaLuna).

It would be ideal to do some tube rolling to get the best of all worlds... is there a tube selection that could work with the Evo preamp that would tame the harsher high end and smooth out the sound a little bit on top? Or is this just a part of the PrimaLuna signature?
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One person's clarity is another person's harshness. Although I've personally never found ANY tube amplifier to sound harsh, my ears are not your ears. Just stick to what you like and be done with it.
I can think of two tube amps that sounded harsh.

Sonic Frontiers Power 2

VAC PA 100/100

I would take a mid fi receiver over either of these.

Oz
I've owned valve components by Luxman, Rogue, Backert Labs, and Quad, and now spent the past 24 hours with this Evo 300. It is a very nice amp, but without question compared to my memory of those other units, it has a more pronounced top end which makes cymbals, distorted guitars, etc more forward than my experience with these other amps. Certainly more so than the Supernait 3 I'm comparing it to. 

Was just wondering if swapping out tubes could smooth out that top end a bit. I guess I will call Upscale on Monday.
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Did you buy the PrimaLuna from Upscale Audio? If so...even if not...I’d suggest calling Kevin Deal and telling him what you’re hearing. Ask him what tubes he would recommend to smooth out the rough edges. Better tubes than the new production East European or Chinese stock tubes will definitely improve the sound of your Evo 300.

I will call on Monday - I don't own the amp at this point, it was lent from a dealer to help make some comparisons with the Supernait 3 as I was having some issues with that amp and I needed some kind of benchmark to compare the sound. 

I do like the Evo 3 though so I will reach out on Monday. I do have a pair of Mullard 12AU7/ECC82s sitting around here that I thought about swapping the Evo driver tubes over the weekend, but because I don't own the amp I did not want to risk any problems. 

Just posting here in the event anyone had similar experience with the Evo 3 or experience tube rolling in the Evo 3 in general that could comment on that. 

The stock sound does seem like it was voiced to be "exciting" out of the box... in fact kind of like a sublte Aphex Aural Exciter effect, or maybe it's just my ears.