I have a Nitro NX750DC with a 90HP Merc.. While at full throttle I will start to trim up the motor and it will stop at a pre-determined spot.The trim indicator will reflect fully trimmed, but, it seems like the ability to trim stops dus to a setting or something on the motor. On my friends boat you trim it by sound and rpm's. How can I be sure that I am getting the max trim?

Dave