I forgot to add; Not sure the spine shafts you're using, but I have trouble finding 11/32 POC stiff enough for the added front end weight. But, finding the heavier spines in 11/32 when using DF is easier. If you do not need the screw in joint, have a machinist center drill the front end of the shaft to fit a length of either brass or tungsten drill rod prior to adding the taper. This is what I'm doing, but again with DF and not POC. This not only adds the weight, but it acts as an internal footing while keeping the outer diameter small.
Best,
DB