May I suggest your 2nd Barb be a Halfling TWF Pick wielder?
You would need to trade one of those tomes for a dex tome.
Starting stats str-16 dex-16 con-16 int-8 wis-8 cha-8.
Use the dex tome before 6th level.
All level-ups into Str.
Feats - 1-TWF, 3-Power Atk, 6-ITWF, 9-Imp Crit:Pierce, and 12-GTWF.
With the Barb Crit enhancements, you end up 17-20/x4!
While Raging your damage looks like-
+3 elemental burst heavy picks in both hands
1d6 + 21 + 1d6 (not bad)
crit 17-20 - (1d6 + 21)x4 + 1d6 + 3d10 = minimum-92 avg-118 max-144 with bloodstone add 24 points to each crit!
1d6 + 14 + 1d6
crit 17-20 - (1d6 + 14)x4 + 1d6 + 3d10 = minimum-64 avg-90 max-116
with bloodstone add 24 points to each crit!
Possible 168 point hits with mainhand and 140 point hits with the offhand!!!! This is with only +3 elemental burst heavy picks! Now imagine you are able to locate "of maiming" versions! It is possible, currently to find +5 elemental burst ****** of maiming! These would add an additional 8 + 3d6 damage on a crit!! And the "of maiming" is untyped, so no DR on it.