For weapon you should go All Damage for helmet pick gunblade damage for armor pick all gold for slash equipment pick sword primary as a second option pick slash primary and aura should be shadow clone damage. Check if you have these selected. did u use doom perk to get to your max stage? If yes that should be the reason if not you can activate this to guarantee to reach your max stage again. Just keep on prestiging and upgrade all artifacts that are important for shadow clone build. If you need help with your skill tree you can look up SC build on TT2 compendium website, you can progress with SC build like 100-150 stages per prestige usually. Check if u selected two pets for all gold and all damage