40 flaps on a hot approach and you're going to balloon up so high that you're apt to stall. the purpose of flaps is to increase lift at lower airspeeds. not act as an airbrake. Yes it is more drag, however it is alot more lift.
I'm afraid your going to find that flaps will make your aircraft hard to handle in the pitch axis.
Sounds like your too high on approach, the trade off for altitude is airspeed. perhaps a shallower approach, with some power on then cut power and flair at runway threshold.
Good Luck