I am running a 97 Formula 312 Fastech 454 mag Mpi's with some motor mods and Bravo drives 1.65. Currently I am running 71mph with 28P bravo1's but hitting my rev limiter that was raised to 5400 on my ECU.
I have some 30p's being labbed now.
Would I benifit any from some nose cones on this boat and this type hull..?
always looking for more

at 70 mph and up I would say that a nose cone would be effective. Give Hydromotive a call. Their nose cones are the best in my opinion. http://www.hydromotive.com/nosecones.html

I would say probably not. Rule of thumb on Bravo's is over 80mph and nose cones will help. You never know though, they may get you 1 mph.

If your not over 80, I've heard of instances where
people have lost speed due to the increased surface area.

Ditto