Hi Jouni,
In what part of the turn does the Evora lose the back end? Or is it bad throughout the whole corner? Any chance you could post your current setup please?
Also, just to clarify, you're on RH tyres? I don't have much experience of R grade tyres but they do tend to grip well but once over their limit they will let go very quickly. Does the car feel the same if you change to SS?
If you want to try fun MR cars, try the 1980s Toyota MR2s. The one with the supercharger was an absolute bullet in gt4.
EDIT: I've just tried this car. Stock, with enough ballast added at position zero to reduce the PP to 450. On SH tyres (that it came with) it was a little unstable, a bit of lift-off oversteer. On RH it became far worse and a real handful. I've had a few beers so am probably not at my best, but here is my setup after 15 mins of drunk driving.
Jouni, adding some ballast towards the front is almost certainly correct, but I understand that you don't want to make the car too heavy in general. I was going to do this but ended up playing with suspension and LSD instead, then ran out of time.
See what you think of my setup with the ballast at zero, then try moving it towards the front.
All items stock unless specified
Fully customisable suspension (most of the settings are stock at one end, I was just changing the rear):
RH 80/105: Unsure if this is the correct rake, need to check. I also tried with front high but it didn't feel as stable
SR 4.08/6.90: rear to minimum, probably overkill.
Dc 3/1: Low rear damper
De 3/1
ARB: 3/1
Camber 0.5/2.5: increased rear camber to give more mid corner grip... although the car was also loose at entry so this may not be necessary.
Toe 0.00/0.60: Stock I can't believe the car was this unstable with stock toe in, I never usually use this much on my FRs! MRs are different for sure.
Brakes 5/3: I reduced the rear in case this was giving entry oversteer. I think the problem was more lift-throttle oversteer rather than braking though.
LSD Fully customisable I/A/

10/40/
40 I don't usually use much if any braking LSD. Most of my FRs can understeer on throttle lift, this car is the opposite. If I want more response on corner entry I usually up rear brakes to help rotation or play with the front camber, damper or springs. Braking LSD affects all types of deceleration, lift-throttle or actual braking. So i added more here.
Ballast 166 at position 0 (worth trying -50, maybe with less ballast)
Cheers,
Bread