I have a 2017 Tracker PT190 with a mercury 115 4 stroke on the back. Currently running a 19p 4 blade Mercury aluminum prop and top speed is 50 with 1 person and gear, 49 with 2 people on board. Boat gets rather squirrely at top speed and I've been told the motor needs to be raised up. It's currently in the top hole as it was from the factory. I tried a 3 blade SS 21p prop today and lost top end and hole shot but it handled so much better. My question is what can I do to get some more speed and gain better handling or am I at the top end of what I should be getting with this motor and boat combo?