before you do anything
make sure your prop is in perfect condition, the only way to ensure this is to have it proff serviced or even consider a brand new one. Even if your prop looks ok it may still be knackered and causing the problem.
a stainless prop can be serviced for about 60 quid which is cheaper than 400 odd for a new one
I had this problem recently, not just in turns, rough water would cause cavitation even in a straight line.
Purchased a new 4 blade ally prop which cured the problem.( A 4 blade will give better grip and initial pull 7 on the flipside lose a bit of top end. ) This type of prop is usefull for skiing.
I then managed to pick up a brand new stainless & this is working superbly and is better for cruising.
Give the experts a call:
If you are running commercially then a prop service should help to be more fuel efficient
Does it still cavitate in tight turns with an excessive amount of trim down which is sometimes required ?