What would be a average speed for a 2003 21XDC with a 2014 250 pro XS , 1.75 SM , 29 pro max, 1-1/4" above pad. 14" jack plate with 2" spacer's 16" total setback . Turning 6,000 rpm. 1/2 tank of fuel , no water in live well, ultrex 80 TM. moderate amount of tackle most in rear boxes , 220 lbs. driver and 150 lbs. passenger , seems like 78 mph is all i can get. Running 3/4" above pad turning 5,800 rpm same speed . is this about avg.