Even though I've said it in the past, there really is no such thing as 'too much' helical. There is such a thing as 'more than necessary', which is what we really are getting at.

The arrow will fly great with full wrapped helical fletches but, like all things in archery, there are tradeoffs. You don't get something without sacrificing something else. To get the stability of full wrap helical, you give up arrow speed. If you go straight offset, you get more arrow speed at the cost of stability. The trick is to figure out the minimum amount of helical you need to stabilize your arrows while giving you the maximum arrow speed.

Or, if you don't want to mess with it, just helical the fire out of 'em and know your arrows will fly straight. Slower, maybe with some extra hiss you could live without, but they'll shoot straight.