I just printed a few prints with the tough resin for the first time at .1 mm on my Form 1+ and they came out great. I too have the original build platform from my Form 1 (not Form 1+). I find I can clean the build platform completely with IPA, just so long as I “prime” it again by dipping it in whatever resin I am about to print in and then running the spatula over the surface to knock off most of the excess resin back into the vat (so it still has a thin layer on the platform when I mount it). This seems to prevent most of the non-stick issues I have had. I also find that editing the support contacts and making the first few contacts (closest to the build platform) as thick as possible, stabilizes the whole print for much less failure rate.