I think water filtration would definitely help. Unfortunately, the FF2 is an AWESOME vape, but it's one of the few that you just can't really put through water. I don't know of any off the shelf waterpipe adapters (a little widget that helps your mouthpiece go into the joint of a waterpipe/bong/glass thing with water) for the FF2.
That said, I feel like the Evo with an HT would be INCREDIBLY smooth. You can filter the vapor so much that it has no flavor, to give you an idea. A lot of cannabis connoisseurs enjoy the flavor of their cannabis and see that as a negative. However, for you, if you have very very sensitive lungs, this could be a positive for you.
I would definitely give it a look. You can retain your same microdosing capability with the Evo, which is not true of some other vapes (namely ones that rely on conduction - microdoses leads to lowered performance).