I just finished a gen as xbow/1H. It was built for level 30 but very similar to your build. Used a regular crossbow. It's tough to do long range shots with anything other than heavy/arbalest, but 4 ps/115 wpf and a blunt 1H weapon are surprisingly effective. With 9 ath, you can also outrun most players even if you don't drop your xbow/bolts.
12 Strength
27 Agility
115 1H WPF
170 xbow WPF
9 Athletics
9 Weapons Master
4 Powerstrike
1 Ironflesh
Your build looks solid, and you should have a lot of fun with it. Even with 5 PS I would still recommend a blunt or pierce 1H weapon for backup. Personally I go for blunt because knockdowns give you a chance to escape from melee combat. Lucky knockdowns can also let you win 1v1 fights where you really shouldn't have won.
Also, don't spawn with 2 sets of bolts. It is extremely rare to run out of bolts on battle or siege servers
Tactic-wise, making a point-blank shot and then running away really pisses people off. You can easily kite 4+ enemies. While they chase you, your team has that many fewer players to fight elsewhere. It can really turn the tide of battle.