the mainhand isnt really usable tbh. needs at least 1mb on it so you can reach lvl 41 mb from:
20 hard point
3 torch
1 anni
1 bo
2 enigma
1 arach
2 shadow dancers
5 mb offhand
3 mb main hand
2 ammy
1 griffons
=
41
therefore, your main hand always needs at least 1 mb on it so you can reach lvl 41 mb for max MB duration
and you dont really get value from the 3 life rep base on it since it just causes you to use rare rings with less rep then 9 so you hit 33 rep.
or means if you use 3 rep mainhand base with a 4rep jewel in it, you get 33 rep from:
7 rep main hand
8 rep on offhand (from 2x jewels)
9 rep ring
9 rep ring
= 33
meaning you dont need base rep on offhand.
Soooo.... that combo of main and off isnt really useful :(
that offhand pretty cute tho. Id probably prefer wb over rep tho since its not particularly hard to get 33 rep since you can get up to 28 from rings and ammy alone.
You can always swap 1 trap gc for a shadow gc
D2:R