Lifesteal Mathematics for Nerds

So, I got to toying around with , now I love SA to death, favorite form and I tailor'd it to perfection but I was fiddling with for lifesteal, which I then looked at gunblade and death's dance a little more closely and that got me to thinking about Rhaast's passive. Here is what happend.

If Rhaast gets 43% of his damage in healing on champions, mixed with ravenous hunter maxed out = 43% + 15% = 58% of his damage healed. Then take death's dance 15% and Hextech gunblade for 15% = 58% + 30% = 88% healing from W. Taking only 33% of damage healed from those items, coupled with revitalized for 5% extra of that healed damage + visage 30% = 35% of your healed health and 40% if you're critical. Then max out 40% cdr. Non-stop massive healing? Am I doing this correctly?

From what I understand here if I am fluent enough, he W's, knocks you up, gains almost his entire amount of damage in healing repeatedly while being super ultra mega star guardian Poppy tank. Can almost entirely forget that two of these only gives 33% of health back when that 33% is increased by 40%. Not to mention I wanna ask towards a Riot employee here - If you strike with a area of effect attack like say or or someone like and it hits five minions, do you heal all five minions in damage separately or is it a hit one target and heal your ability once. I assume you heal per target with one ability which basically makes that 33% null and void.

The reason I post this is because potentially there is a Rhaast out there who heals more than AP on a good day. That to me is quite frankly crazy.