5th Gen Camaro Hard Start/ Starting issues when Engine Hot, Adding Ground Cable

2010 Camaro, LS3, Cammed, 416 stroker kit. I have been dealing with this issue for a while now, previous owner replaced starter with a high torque starter and replaced the battery also replaced the crank sensor, all that did not resolve the issue. Highly recommend adding a ground cable from the engine to chassis, before replacing starter or any other part.