Sergio, Tried the 4-fletch shield cut vanes on my Axis arrows and like it so far. here are some pics of the arrows I'm using now and that will be flying outta the Silvertip.
This is the tip, 160gr Snuffer on 42gr adapter with an aluminum footing.
this is just to show how tight of a fit the 75x105 4fletch is on the Axis.
Here is a 4fletch and a 3fletch I made with shield cut vanes...love the vanes! I chop em with a knife. Works great.
Here is one of the several similar groups I shot last night with the 3vane on one and the 4vane on the other. Don't notice a difference in speed. The elevated rest I put on has REALLY improved my accuracy. This is at 19-20yards. Ghostman, we need our pics now please :D