I footed these poplar arrows with walnut after I broke these three. The footing is really longer than I would prefer, but most of these broke or split requiring this length of footing. And yes, this length footing does change the spine. With one arrow in particular, I went from a 125 grain point to a 190 grain......still doesn't shoot well.
The flu-flu with the Ace Hex head is terrific for stump shooting......really tough combination. I might make up some more of these......before I break them.