The only parks I could really vouge for are SFMM and Knotts berry farm since I visit them the most frequently and can verify rides that are consistently rough.
For SFMM, I've heard Psyclone was absolutely terrible. I was alive when it was there, but never went on it (not really sure why). I've also heard Flashback was rough, but was never alive when it was in operation.
For me, last time I went to SFMM, Colossus was probably the roughest. In addition Viper is pretty rough and theres not much they could do for it but it's frustrating cause then theres rides like Revolution wouldn't be so rough if it didnt have the stupid OTSRs.
At Knotts Ghost Rider is really rough and its really frustrating cause it would be so much better if it wasn't as rough.