If you do add a belly lam, you should consider thinning the ERC down prior to the glue up. Adding a very thin lam to a practically finished bow is likely to double the draw weight. Re-tiller the bow down to maybe 25-30# while flattening the belly for proper glue preparation, and you should be able to glue down a 1/8" lam of wood, resulting in maybe a 60# bow with room for tiller corrections.