Cavitation did not start immediately. Thanks for your input. They are dried out now and cleaned inside so the next time out we will do more investigating. It could just be inexperience as well, not having a point of reference.
Besides leaking into the hull, is there any other symptoms of a bad carbon ring? We bought 2 - 2012 GTI SE 130's from a dealer, I am pretty sure they never even looked at them and us being new to skis were oblivious. But first time out we couldn't flush them, the line was completely clogged...