What is a safe engine height with motors bolted to the transome,i over heated a right side motor on my 21 with twins,the motors are on there highest setings on the clamp bracket,was braking in some new rebuilt motors ,and was just keeping it at 3 to 4 grand and i beleive i just wasnt going fast enough for more water preasure,i have seen the built in ramps,whats your opinions on them? Thanks Jeff