Just got a PM from solartje, I'll copy/past here if someone else finds this interesting too
"first of all... dump the shield.
not right type, not high stats... u can easily find better. or even trade one, they are cheap. do 3 4 cows in hell and ull find one.
use a crown shield with the best ed/ar mod (60+ed/110+ar). (more dmg, more ar, better block)
second: the ed bug is only from jewels. (the inherit ed from the shield is not counted in the bug)
the bug means: if u have ed on a jewel, the ed is only counted on the min/max part that u dont have.
meaning
if final stats (so even if u use one plain ed jewel, and one plain max jewel) are = ed/max, the ed is only add to the minimum dmg, if u use ed/min, the ed is only added to the max dmg, if u use ed/max/min the ed is not counted at all.
but this doesnt aply to the inherit ed of pala shields. so u can socket safely with max jewels, the ed from the shield will be added on max and min dmg. just dont socket any jewel with ed/max."