im 6"2 have had risers on all my bikes.. have 30mm risers on my yz450 and that helps a lot!! also when you start getting more confident with attacking try pushing your bars foward a bit to free up some cockpit room(helped me keep my elbows up 2). try taking baby steps here as if you push them foward a lot right away it will screw up your handling cos your not used to it 
if you still need more height you can get a whole diff triple clamp that is adjustable foward and back and up and down.. or if thats too expensive i know you can get yamaha standard 20mm higher bar mounts so add that to 30mm risers and thats 50mm all up. id check to see if honda have these for your 250
I live my life a quarter mile at a time for those 10 secs ....LOL
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