Can anyone confirm this? Because last time I played my reflect autocasters, CD does not proc the Ele sword auto... but it's been a while.
Anyway, especially if you're not using your aspd, I'd stick to Ele Sword and put in random autocast stuff or go with VF. Meteor off of VF is pretty nice and you can BB whenever you're not swamped in global cooldowns.
Ele Sword in particular is great because of the extra Matk for your CD. But it's not the clear-cut best autocast weap like it is for RG because you can't reflect single attacks to multiple targets as RG does with RD, meaning you'll have leftover monsters at the ends of autocast proc storms more often than not.
Not sure what your stat build is, but unless you have 90 stats everywhere, I might say go for a Valk Mant instead and a resist shield - cut down the damage you take and the amount you NEED to take in order to reflect damage at all at the same time.
As for Vanargand Helm... Does it proc on magic attacks? I didn't think so but I honestly haven't tried. If not, then you'd be depending on your auto BBs since you'd get almost nothing back with reflect damage (especially if you used High Orc for your reflection). I used to use a heal/heal item booster instead or an upped St Pattie's Hat.
cd in mouth does proc ele sword if level 3 is casted, while vana just states on dealing dmg you get returned sp/hp. these are the kind of comments i was looking for because it is informative.