Thanks for the tip I like that and its what Ill do. I dont really need to hide weight in the handle either. I can just put it in the back of the gun and it will be hidden by the rubber butt pad.
I don't know if you're aware, this handle has weights that fit exactly inside the frame. Easier to do this and the weights are removable if you ever choose to add a reel which will change the balance of the gun. If you epoxy the grips they will not be removable, and it will be difficult to access the rear two screws of the handle frame if ever need to remove it for travel/storage. For these reasons I recommend you use the built in screw holes to hold the grips together.