The different way Vladimir's Passive interacts with Rabadon's / dragon and Cinderhulk bonuses

Continuing with my previous post https://boards.na.leagueoflegends.com/en/c/gameplay-balance/vRjaKMYT-the-way-vladimir-passive-stacks-with-rabadons, I tested it. I'm not sure if it's supposed to work like this or not but this is not for me to decide. I've placed all formulas if you wanted to compare them, and here they are:

Cinderhulk, taking note that it stacks with the bonus ap but doesn't with the bonus health .

Doesn't stack = (2.5% bonus health) bonus ability power and (140% AP + 15% bonus health) bonus health.

Stacks with bonus hp = (2.5% bonus health) bonus ability power and (161% AP + 15% bonus health) bonus health.

Stacks with bonus ap = (2.875% bonus health) bonus ability power and (140% AP + 15% bonus health) bonus health.

Stacks with everything = (2.875% bonus health + 0.525% AP) bonus ability power and (161% AP + 15% bonus health) bonus health.

This is Rabadon's, taking note that it stacks with everything.

Doesn't stack = (40% AP + 2.5% bonus health) bonus ability power and (140% AP) bonus health.

Stack with bonus hp = (40% AP + 2.5% bonus health) bonus ability power and (196% AP) bonus health.

Stacks with bonus ap = (40% AP + 3.5% bonus health) bonus ability power and (140% AP) bonus health.

Stacks with everything = (40% AP + 3.5% bonus health) bonus ability power and (196% AP + 1.4% bonus health) bonus health.

Dragon stacks the same way as with Rabadon's, and same thing with new Guinsoo. These 3 also do not stack with each other so you get a final ap % of rab% + guinsoo% + drag%