Jax changes
I really think forcing a Jax to use his E is a good part of counter play to him, mana gating in the laning phase as a jax main is something I am ok with. (low level E mana cost is down by upto 20 mana, which as you only put one point into it a lot of the time, is -20 mana for a decent part of the game)
I do think he's a bit weak though, Can't you increase his HP/lvl slightly so he actually gets tanky lategame? His laning phase is always meant to be rough, with lategame payoff. Why his base HP, hp/lvl AND armour per level were all nerfed in patch 4.11 I don't know, but it was super shitty.
BASE HEALTH 561 ⇒ 535 HEALTH PER LEVEL +98 ⇒ +85 ARMOR PER LEVEL +3.5 ⇒ +3.0
This is 260 HP at level 18, and 9 armour. 26 HP at level 1 is huge too.
Couldn't you buff HP/lvl back a little bit, so at level 18 he is a menace again? (not as much of a menance, though. I agree.) This would also scale with his MR armour on ult.... when its down... COUNTERPLAY
TL;DR Can't jax keep his weak lane strong late identity a bit more?