im a Lvl 64 SpellHowler and i've been using a +12 Homu with acumen since lvl 40. It still works pretty well 2 shooting yellows and pinks on the top part of Valley Of Saints area.
my suggestion is that u either overenchant it or try to afford a +9 or +10 homu and get urself a nice dwarf that can craft u shots for cheap. still u blow up some homus trying to overenchant them, u will have C grade crystals for shots.