mmp with 1800kv

I am thinking about picking up an cc 1800kv buggy motor and I plan on running it on 4s. I know some of you guys are running this setup but is seems that the total motor speed of 26,640rpm is a bit low, anything to be concerned about? I thought we wanted to shoot for the 30,000 to 35,000rpm range. if i gear my Ve8 to 22/50 i will have the speed i need but will i lose efficiency? Will the lower kv rated motor be easier on the mmp? any other draw backs to this set up?