ok so after more testing back home , we have the answer: the offhand doesn't proc indeed without the use of the dual wield skills . offhand Hail works great if used with dual weild skills but i don't want this to be another dual wielder .
so .
in order to keep the build as it was ment , ATMG as main attack with bloodbath only for the buff that grants block and leech + Blade barrier only as support skills , instead of also fighting in melee range to benefit from the offhand proc , i have decided to replace the Hail claws with another abandoned craft with bloodlust oskill for mid game and Dawn RW (El+Xis) for end game .