at these low lvls u cannot really tell what a build is really like, u should go to donwhang south gate and watch some builds, try find capped players that are fully farmed so u know it is fare and then u can see how the weapons work (unless they have sun gear)
bow double shot is not suppose to be strong just a fast shot to finish off a kill. cheak the damage on ur attacks and also the (%) after the damage plays a big factor in the power of the shots, bow has 2 of the strongest chinise str builds most strongest skills which are devil arrow and strongbow which u get at later lvls, also are u adding ur stat points in C(C button) window
heres a good site to see dmg stats for the future
http://www.konpaku.com.br/silkroad/habilidade.asp?habilidade=skill&mastery=259&serie=2595&skill=330Edit~ also ice imbue is the weakest imbue ingame , strongest is fire imbue, str characters dont really need ice and remember theres only a 300 mastery limit in this game so calculate ur final build correctly or it can cost u alot of gold/silk to unlearn skills