One other note concerning the PDP weights... I quit using them and went to the brass inserts because I didn't like that much weight floating behind the point insert. About one out of every three times I hit something hard with one of my weighted arrows, the insert would either be forced out of the end of the shaft a little, or it would push back and mushroom the arrow.
The weights are a smaller diameter than the inserts, and I have a funny feeling that it created some unnecessary wear and tear on the front end of the shafts. You can achieve a good glue bond the entire length of the brass inserts, but not so with the PDP weights.
It's a poor analogy, but I felt like the rear weighted inserts produced a "slide-hammer" effect on the points. YMMV...