Quick question... My boat has an issue with cavitation/ventilation at the current height (I can plane but an average turn results with too much "blow out") and I am trying to prevent lowering the engine. This morning I noticed that I could run a larger diameter prop based on the 3/4 inch between the blade tip and the bottom of the cavitation plate (anti-ventilation plate) and my question is how close is too close regarding the distance between blade tip and the plate? Thanks.