The intelligence charm is not needed, make sure your Lightning charm is in the charm slot and not acc. slot, and your going to need a heal charm. One alike your lightning there, other than that you're wells should be able to do about 60+% of the time [with the heal charm]. Through time you'll need to upgrade your offensive charm , heal charm, and intelligence weap. Once you've upgraded those your wells will have a much higher chance of succeeding. Look for these kinda stats on the items for a great chance of doing wells
Weap: 35+ Int
Armor: 35+ Int
Charm: 120+ Enhanced Effect
Heal Charm: 100+ Enhanced Effect