I went with the 240mm clutch and DMF from the start - needs the 5.5mm spacer, longer dowels, EU starter. I have omitted the turbo support brace for the last 10 years, and while I'm sure it would be more solidly mounted with it, 10 years and 400,000 additional km on the swap have not shown the lack of brace to be any issue on my car.
I went with the Sach's SRE kit from Darkside performance, and have gone through one additional DMF (usual rattle when worn) in the above 400k km. the DMF likely would have lasted longer had I not used the car to teach two teenagers how to drive standard
As far as longevity, the SRE kit has been stellar. When I replaced the DMF at 550k km (300k km on the swap) the clutch still had a measured 85% of the friction surface left. I replaced the DMF, the release bearing, and that was it.
The clutch Has. Never. Slipped. I have torture tested it in the last 10 years towing overloaded utility trailers, through the mountains in Virginia fully loaded up and down hills with four adults, packed with luggage and a completely full roof carrier up hill in 6th, and no issues at all.
is the clutch I went with, and it has been well worth the extra expense given the many documented cases of slippage like yours and transmission synchro faults contributed to by SMF solutions.
The only two drawbacks I have found on the above kit are heavier pedal effort (HD clutch, so to be expected) and that it will chatter somewhat on takeup from time to time - moreso when fully warmed, like in traffic. Chatter can be pretty well eliminated by raising engine RPMs - this will not be a clutch where you can Idle the engine and slowly let out the clutch - that'll work, but it will chatter.
f I were to do it over again, I would go with the exact same combo, which I like to call "Turbocharged Triumph" - a name that helps me
Get Inspired with Creative Naming, and I have a spare EU only starter in the basement just in case, but haven't needed it in the decade I have been driving the swap.