I was running fully loaded with the bolts and washers at 8-9lbs on a 09 twisted 2871 and running 8150, with a 36* and a 36/44 didn't really stop the rpm but created more belt heat and anything over 9lbs I didn't run a 36* because I crushed the rollers with that much pressure on them. My dealer ran 36/40 on bd kits and they worked really well. But at lower elevation I would prob just run a 38 or 39 and get the plates
You can also run a softer spring, that might be the easiest fix
So wyo you are running about the same as me. I have all the weight I can get on there with bolts and running the gold polaris spring 100/275 and I have a 36-42. I do not have the plates installed. 10 psi at 8000ft is about the max any more and it hits the rev limiter.
I would like to try a higher start and lighter finish spring to bring rpm down some and not add any weight because it got real lazy just adding that long bolt to the tip maybe try someting in that 125/250 range.
So it's been a year since somebody posted something about the C1T's. There should be more experience to talk about atm :face-icon-small-ton
I'm about to order the mds weights, springs and helix for my custom M7(800cc) GT2871 turbo and would be glad if someone could chime in with a "proven to work" clutch setup. I'm at 0-3000ft on 6-7psi max boost with pump gas. My thoughts so far after been reading for a couple of hours on here is a straight 36deg or 38deg helix or maybe a 36-40 would work fairly good? along with a gold cat spring for engangement around 3600-3700rpm and stock orange sec-spring. I got the 10,4" cat secondary installed too.