[Gameplay] Rammus q doesn't hit large hitboxes

I pretty sure this is a well known issue, but I never see it reported. When you're playing as rammus, and you're trying to hit something with a very large hitbox, it doesn't always work. The best examples I can give are if you are chasing a fully stacked level 16 or above Cho'gath, or trying to hit baron or dragon. For some reason, if you don't try to go through these things, you'll simply stop before hitting it. I've had this happen so often, and have heard others complain about it, but I've never seen anything about it on the forums. The best way to recreate it that I found with Cho was to simply click on a fully stacked Cho with max ult level (so he's as big as he can be) and click on him once while he walks away. Rammus will just go up to him and move sporadically when close to him, but he won't proc his q unless you try clicking past the Cho. With dragon or baron, you pretty much just click them once, and he won't actually proc his q until you click past them. I just thought this was kind of an issue mainly because of Cho'gath because it's harder chase him down when you can't just click on him and instantly follow him when he changes his path.