I have a Mercury 9.9 2 stroke on my 12' Lowe jon. The anit cavitation plate is now aroud 1.5"-2" below the bottom of the boat and the only way to raise it would be a mini jack plate. I have a hydrofoil on to help with planing and its below the surface of the water at speed so I may be losing a considerable amount of top end due to drag. Would the gains from raising the engine be worth the $100 cost of the jack plate?