Vlad and absolute focus

So while playing I noticed an interesting interaction between Vlad and the rune absolute focus. I know with certain items like stoneplate the HP you gain from it you get to keep after the effect wears off similar something like a Renekton or Nasus ult. While I know this this isn't really the same I think something should be done to fix this with vlad because late game your ability power will start to fluctuate 40 AP at certain health points because one second youre above 70% health so you get ability power; Once you get this AP though, your health is no longer above 70% because of your passive health you gain from crimson pact puts you below the thresh hold. BUT WAIT! since you lost the AP from absolute focus your max health is decreased so it puts you above 70% health again. Here begins the cycle of your health bar going up and down because of the AP your gaining and loosing. I'm a Vlad main and while I'm not saying he should gain extra healing just cause he made it above 70% health can we make it so its consistent? (Although I would love the extra healing if you put it in) While I don't think this will hardly make or break most fights 40 AP and around 85 health is enough to make a difference. All I would like is some consistency!