Varus improvements?

Hello, i honestly dont know to much about stats or balancing. I'm here because i wanna know are there any changes that might make varus more viable in the game today? Here are few problem i see after playing a ton of game with Varus.

His Q (Piercing Arrow) While it can be nice dmg wise gets reduced by 15% for each target he hits, I've lost so many kills and fb's just because of this right here, it maxes out at 33% but shouldn't they scale it down so it doesn't hit it max so fast. It really seems to fall off late game even with a high atk dmg build.

His W and E are honestly fine the way they are, maybe a debuff/burn from his E (Hail of Arrows) that reduces healing for 2 seconds when they also walk out the aoe and refreshes if they walk back in.

Varus's ultimate, which i never really understood it being Full ap scaling, ap is fine but it being 100% ap makes it dmg wise useless. I know dmg isn't the main purpose of his ultimate but still 150 / 250 / 350 (+ 100% AP) With all the magic resist going around this does almost nothing ill be lucky to see a bar of health drop

And lastly this one also pertaining to his ultimate. The time it takes for the chain to spread (2 seconds) feel honestly too long i don't see too many people get caught it in unless we're running away or its one small area of team fights in which case his ult mostly doesn't matter because the intention to run doesn't really exist at that point and if they wanted to the chains would be off by then.

These are a few of the things i dislike or would like to see changed plz tell me any idea you may have, tell me i'm wrong honestly anything helps