Easy, small damage bonus for every successful hit on a target with Whirling Axes. Buff up the damage a little but not to much. Problem solved!
I like it as is though. It is a little less powerful than the hundred blade strikes, but its good for mobs and turning around really really fast. Mind you I am only PvE at the moment and not very far into the game so I will probably revisit it all at the end once I max out.
I was thinking about experimenting with a pure power & precision build dual axes and a GS but upping the Crit% given how many times you hit with cyclone & whirling surely that ould have to make a difference. But as I said, fairly new to GW2 I am probably putting a fairly silly suggestion out there.