Ive just fitted some 15 mm risers off ebay and lift it just nice. My main problem Im thinking is the bend of standard bars, where I seem to like them I feel as if my wrists are turned inwards and my elbows go out. My prefered bar has always been Renthal 613s so may go with them when I get some funds.
If some of you feel the rubber inserts in the top yoke cause twisting, you may be able to go with the same things I used on my older 4MY 660 from Kedo in Germany... plastic inserts that do away with twisting bars