I’ve had good luck with ERC sapwood holding up to violations. I had this one pull back to 40# at 27”. For te back all I worried about was getting an even layer of sapwood about 3/8” thick. The back was horribly violated but held up for a couple hundred shots before I put a paper backing on and sent it in its way. I haven’t done many ERC bows but the ones I have, have held together fine so far with horrible violated backs. Though I don’t let the heartwood show through the back. It seems to act different and am afraid it wouldn’t take the same abuse.
Kyle