You can get weights that screw into the back of your inserts.

You could use one of the many "regular" style mechanicals on the market that have been killing deer for years. Rocket Steel head, NAP Scorpion XP, or Wasp Jack hammerwould be my choices.

You could get the 25 grain"boosters" from aftershock archery.

Or You couldtake my adviceand just use one of the many many manyfixed heads that fly every bit as good as mechanicals do and then you don't have to worry about the broadhead "working" when it gets there