I´m playing a fire based sorcerer (Piercing Fireballs Embers with Cinder Song + Soulfire, Triple Fire nova on Teleport) and it´s my highest damage build so far.
I use Titan Heart and when Lavamancer is my only source of leech (1%) I don´t leech one tiny bit. I understand that 1% is not much, but I really don´t leech at all! When I use a badly rolled Bleeding Heart with 5,3% leech, I leech like crazy.
So either Lavamancer still doesn´t work at all, although it was supposedly fixed here: Beta 0.7.6 Patch Notes or it is not working with Titan Heart although it should (and does so with Bleeding Heart): Spell Damage Leech not working properly on Mage/Sorcerer
All in all, phenomenal patch! Keep up the good work!