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This is strange. Initially just the ps then all belts. What a gremlin. Been through this (like many) and went to serpentine years ago. Not that that is the solution, and it shouldn’t be the only one! Drag on the ps belt was a cause for me. The clutch on the fan contributed. A flex fan helped. Pulley alignment was a major contributor for me that dogged me a long time as I was trying to sort this out. Lots of experimenting with the belt off and the belt on for comparisons. Later, a serious upgrade of the engine caused belt squeal at the water pump pulley and it ended up being drag, again, arghh. Hard pull on the belt, bizarre. Not the ps but still a drag thing. Went electric fan and the water pump pulley belt squeal was solved for years now. Not saying these are solutions, just thoughts that may or may not help. Usually just a belt for those who are fortunate. Oh yeah, excessive tightening is not the long term fix and can be hard on pulley bearings – I learned that with the alternator pulley. Interesting comment on the hyrdoboost. I switched to hyrdoboost later as a part of an all-around brake redo and to address the loss of vacuum after the engine build. Manual would have worked but I preferred the hyrdoboost system. The psi thing never came up with discissions with the supplier of the hyrdoboost and all has been good since putting it in 2008.