Poppy Ult

I know that if you channeled the ult on poppy it makes targets that were ulted sorta "invincible" (i said sorta because sometimes they can die during it (is that a bug to?)) until they reach their destination and it makes sense. However if you just tap the ult just for maybe some combos, damage, or knock up they are still invincible? i mean its not like its a that long of a knock up they shouldn't be allowed to take damage. I noticed this when i tried to combo my abilities for example Q and just to make sure they take the damage tap the ult for some more damage and guaranteed Q they took no damage and their character grayed out. But that is just the bug part.

Could it be possible poppy channels the ult radius slower? Because its a small circle for like 1 second then expands very rapidly to its full radius; why would i suggest that? because its kinda hard to make an accurate distance fly-by if i wanted to sorta ult them towards me if i'm in the direction of their base.

If all of that stays the same i'm ok with it; just some suggestions and besides i really like the rework, marvelous job Riot, really good work here.