You posted this in the wrong section. Post it at the Characters and Skills section, I'll be glad to help you there.
EDIT: Ok, it was moved. Fire is just essential for a Full STR bow. You would suck without it. I recommend you to go for 90 Pacheon 90 Fire, and then you can choose between 90 light
or 90 ice, 72 ice
and 48 light (or vice-versa), 60 ice
and 60 light, or whatever you prefer. I recommend you to go 72 ice and 48 light (reason:
viewtopic.php?f=4&t=94536).