Well, you are on the upper end of fitting an RM very well. That being said, it is TP199's favorite bike of all time. Get some handlebar risers and you should be good to go. 250 four strokes may be able to MATCH 250 smoker lap times, but that is the only place they are even. They are superior in every other aspect, unless you hate the sound - which alot of people love (I like smoker and thumper sounds)
No, I don't own a 250f - I own a 450. I like the 450 but not as muchas the 250 smoker. and I have ridden several 250f's and I'm sorry but they are weak sauce.