While I have mixed feelings about sated devourer because of it popularizing the afk farming strategy, I think it makes up for it with one thing, Ap Xin jungles a thing that can work in solo q now, and if that isn't a good thing then I don't want to live on this Earth.
i'm not sure about its numbers and i think its tricky to balance around. I'd rather it just simplifies things and just deals an extra auto every 3 rd hit that is say 30% of the damage you deal as magic damage.
what if i told you ap xin jungle can be a thing without devourer. fix how spellvamp works on aoe spells: http://boards.na.leagueoflegends.com/en/c/gameplay-balance/TaXPYTao-spellvamp-100-scale-on-aoe-but-with-100-cap-as-thoughwas-singletargetoverlap-w-current-equation
and rework rageblade. https://mocklolpatchnotes.files.wordpress.com/2015/07/ragebladehexbladefull-smll.png?w=390&h=300
even gunblade would be half decent on him.
hence why its hard to balance around in its current form. there was a reason for it being every third hit on xin.
i actually used to play him even before the changes to devourer. i should retry this build on him: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1817053922/38492205?tab=builds mhhh this was with the old ludens tho. 120 ap
you should give akali jungle a try as well. works with her passive and she heals well in general.
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1911183013/38492205?tab=overview
could also try 
