As TexasT replied, it's most likely too much pressure. The detent could be the cause. If the pressure spring and or boost valves were changed that could be the problem. No the switches are not the problem. A pressure gauge is a very good investment. I like to know pressures on any fresh rebuild.
Have a BMS hub if you’re interested. $120. Shipped in the states. It has the cam and crank rings. Message me your phone for pics. I couldn’t get them to load here.
Have a Precision 70 GTQ with a 85 exhaust housing. 4 " inlet and 3" outlet. This is an older turbo that was just removed in working condition. $500. shipped in the lower 48.
I have one that is nice but it has a flange welded in for a waste-gate. You could block it off. Message me your phone number if you want pictures of it.
Don's posts were interesting and his car was too. I can practically hear him explaining the apply area of the extra clutches, which makes sense. Unfortunately most of us that tried it found burnt frictions and steels and went back to stock friction counts. I am only a hobby builder not a pro but...
I would talk to Dave before ordering parts. Someone put an extra friction in the forward if it has 5. This may have contributed to the problem. 9 in the direct drum sounds good but has proven not to work well. Thin steels don't absorb the heat well. Also I would not use a wide band unless your...