I haven't deciderd if alcohol helps or not. I have used it and not used it and have not seen anything different. I think it is the temp of the soap personally. If it is a hotter soap things stick together better, Nothing scientific just observation.
have you done any layers? I poured some individual molds 1/3 full of cp, intend to unmold, cut out a shape with a cookie cutter, cure,and then pour the same mold 1/3 full with clear mp, lay in the cured cp layer and then fill with the clear mp. I hope the layers stay together Any observations with layers where you combine cp and mp? Thanks!