I've used 4-fletch setups in the past. They work great at stabilizing broadheads and, like ijimmy said, I don't see why a 4-fletch arrangement wouldn't work thru a wb. 75X105 setup.

But I have to say I've come to consider 4-fletch to be a waste of time and money, unless it's for special applications like making fluflu's or if you're intending to use REALLY big, nasty, unvented fixed blade broadheads. For most 'normal' uses, it's not enough better than 3-fletch to justify the extra expense.

Although.... it IS kinda nice with 4-fletch to not have to worry about whether you're nocking the arrow with the cock vane oriented properly to the rest.