Johns150

Had it out for first time sat. I just bought this boat it was a lake boat and well taken care of. I am new to the boats but have had many skis
my right engine reves to 7000 on take off with very little go. Left seems fine if I do one side at a time left gets it on plane ok right just stays at 7000. The wear rings and the blades are new and I checked the gap both ok.
I saw the shaft seals go bad on these. I pulled the covers no water leaking but the right shaft seemed like it was about 3/4 of in more towards engine then left. I greased both fittings when I did the one on the motor side the shaft moved to the rear of the boat almost 1/2 in. Could this have been my cavitation problem.
Thanks in advance
John li ny