1st I say wait for your "DIY belt wrap"...(even though "I dont have one" ) but you say belt slippage so...2nd I say your SC engagedment issues seem like the typical IC pump but you seem to have done ur homework on the threads...so I figure you have changed IC pump(if not do so).....I do notice that my pump still acts up sometimes...but I didnt get the "Johnson Pump".. just a newer Bosch one.