never had a Hl but i know that b6 and b5 weps are better for pve, since they raise ur reg attack and some even have a poison ability( not sure how it works tho)
i think its possible to drop a b6 axe, ive dropped some g5 at commies so they might have some b6 there too but they are rare.
no idea on jewels for Hl but if u want to have an attack boost then i would advise black pearls if u socket ur whole armor set with lvl 3 jewels thats 15% extra wep. attack also u can use the phys eva jewels, help my knight greatly.
and i socket with hp regeneration and/or armor def ( but have no idea about what jewels help a HL)