Finally beat this bastards.
It took me 13 tries with cycling through different loadouts and weapons.
With no shock the akimbo AMPs (doom & gloom) triples packed on legendary.
M16 (skull splitter) triple pack with a LPVO for long shots. Also on legendary.
finally, the M 79 triple packed.
I went down twice during fighting him. Once I get done editing the video, I’ll post it here.
Thank you all!