Yeah, hot glue is tricky... I've learned to use just enough to get the job done, but still be removable if need be. The first Dual Strike hacks I did for my T2 guns, I actually just wanted to hot-glue thru the screw holes on the boards, to pin them down by the corners inside the guns themselves. It didn't seem like any glue was coming out, until I realized I was pumping glue in underneath the boards! Now the whole board is permanently welded to the inside of the gun...

Hopefully, I'll never need to replace it, but if I do, I'll just have to live with a dead board cemented inside...
If you're going to use the glue, I'd suggest just putting a drop in between each crimped pin, rather than flooding the whole thing with gobs and gobs of it! That way, you can still pick the stuff out with a screwdriver if need be.