Would it make sense to grab light armor proficiency from eldritch knight? I know it doesn't provide as much mitigation as it used to (light armor gives bab prr, so 14 prr by lvl 28 if you don't increase your bab somehow), but some is better than none, as long as you don't sacrifice too much to get it. It would cost 7 ap to get light armor from EK, 10 ap if you get another 10 prr from improved shield.