IMO, STR hybrid bows are cool. It's been proven that they deal great damage. What's your naked physical balance, btw? Try to get it to around 85%.
90 fire / 90 pacheon / 60 light / 60 cold.

EDIT: I've tested the 70:70 bow. I loved it, but i've also played a STR hybrid on a private server (ecSRO). It was even better than the 70:70 I played on ISRO. Good overall damage, high crits, and it could have been even better with snow shield (ecSRO only has the old 70 cap skills)
