Could be a taper tool problem--what kind are you using? On the field points, make sure you have the right size for your shaft diameter. With broadheads, you can get different sized ferrules with some to fit your shafts better. You might be able to push them on further also. Seal the naked wood with glue to avoid them sucking up moisture.

I clean the inside of the points/broadheads with acetone, then rough them up a little with some sandpaper--very seldom have one pull off.

I use hot-melt (ferr-l-tite) most of the time, but I have also used 5 minute epoxy. You can get the points off with heat using either of those. I've never used Gorrila Glue.

Chad