[{quoted}](name=Deez Crits,realm=NA,application-id=yrc23zHg,discussion-id=2KaOJxmu,comment-id=000000000000,timestamp=2019-07-05T15:47:46.121+0000)
I think your changes shift her identity from a mix of siege/lane bully strongly towards the lane bully side (like Draven). 35 AD from 1 rank in Q is pretty substantial. Draven's Spinning Axe is still stronger at rank 1 (bonus AD scaling), but at the expense of having to catch axes, a cap on how many he can have going at once, and shorter range. You're giving Caitlyn a much safer spinning axe at level 1 with your numbers (and this is before considering the fact that she has an AS steroid on it).
I think the bread and butter build would be Runaan's into Infinity Edge and I think that would be a somewhat problematic Caitlyn to face. You wouldn't see her cashing in on plates as often due to weaker push power (at least early, before Runaan's is built), but she's still going to get easy lane priority because she won't let you near the wave without being punished (especially with her passive!). And, as you mentioned, bonus AD still gives her pushing power due to auto attacks.
She might even rush a vamp scepter and become a much safer version of Draven. In other words, due to her sheer ability to harass her laning opponents, she either gets to have control of the wave (arguably makes her siege even stronger because of her higher AD + attack speed on Q so when the wave finally crashes, she chunks the turret extremely hard especially considering headshot).
You make a point that your changes give Caitlyn 'niches against weak ADCs in lane' but isn't that what she's doing currently? Or perhaps you mean that Caitlyn is just too strong in general and is too flexible in the bottom lane.
I don't know if these changes would make her specifically a niche pick. I think it's hard to make changes causing her to be an insane lane bully while also having high range. Her bonus AD makes her strong in lane and, even if she won't be at the enemy turret as often early, by virtue of having strong range and the ability to itemize for wave clear through Runaan's (or Shiv as you mentioned), she becomes a very effective & safe sieging champion. I'm not sure if numbers being tweaked would help make her viable because I feel like it's an identity crisis in that she is too good at too many things so the numbers can never be balanced - she'll either be overwhelmingly weak or strong and it's difficult to find numbers that give her a middle ground.
Well with this much damage caitlyn's pushing power would actually be much stronger than her current form when and only when she is uncontested. You're also forgetting that draven has a better burst than either version of caitlyn and a bigger steroid. Having to catch axes isn't really a problem in the types of trades draven can and wants to take vs any caitlyn lane (Ie combination of supp and jungle + caitlyn in the scope of the current meta and next best picks ) on either blue or purple side.
This caitlyn will be safer than draven , yes.
Caitlyn was designed to be a lane bully, but in modern league, a lot of the time, she isn't even picked to or functional as a lane bully anymore. Some lanes, actually can bully caitlyn and her support and this caitlyn will still be a safety pick in those situations.
The change would highlight caitlyns strengths and shift them away from line waveclear a little bit.
She would also be weaker when she is bad vs certain types of kill lanes and midgame comps, ie those with lethal on her and difficult threats.
She would be MUCH safer vs various poke lanes however, and she would be much safer vs anything that doesn't have high threat on her because of higher lifesteal scaling between more AD and the attack speed steroid.
That's just better design and a lot of cool new comps would incorperate caitlyn and try to answer her.
Even with these changes, there are still reasons to pick Kaisa, Sivir and many other champions instead of caitlyn, it wouldn't really break anything.
The people who have a problem with this would sooner be the bot lane duos who want to blind pick vayne alistar in solo queue and hashinshin the lane phase.