Riot you can keep giving Jax pointless buffs, it won't make a difference
He still won't be a competitive pick because he's not reliable
His /level base stats are terrible for a melee autoattacker with no ranged poke/farming tools, Irelia has 13 more armor and 100 more HP at level 18 baseline, Hecarim has way more, Olaf has way more HP, Fiora has more hp and armor, etc
He has the same level 18 HP as Kog'Maw lol, this is a melee champion with no ranged poke, sustain, or farming tools
But you can keep buffing his R and E, see if it gets you somewhere