RE: How many f.p.s. are lost with the wisker bisket?
Ditch the peep and rubber tube and pick up 8-15 fps quick and easy. Slap a No-peep on and you're good to go.
I suspect with straight fletch, if you're biscuit is properly sized and broken in, you are losing minimal fps. You may wish to consider fletching with the new NAP spin vanes if you have any broadhead flight/control issues.