Epoxy is the opposite of white/alaphiatic glue. Too much pressure and it squeezes out - starving and weakening the joint. I usually set the pieces on a flat surface with a piece of wax paper under them and set a lead weight (usually a ziplock bag with shot in it) on top of the stack. I just did one that was three 1/8" ply laminations and I stuck T-pins around the edges (into the base wood but not the pieces themselves) to keep them from slipping.