As a very annoying thrower (
), I can't tell you all the secrets (else other good throwers will be mad everybody knows "it" , and also too many will start throwing or will get better at throwing with that trick) but if you plan to throw , get 5 or higher. Under that it's just useless. Your pierce won't do much damage, your throws will be slow, inaccurate and will only be feared by the peasants.
If you really wanna throw , with 0 wpf, you'll be overspeed by anything (archer , xbow , other throwers) and if you miss someone coming at you , you only have 1 chance and if you hit, chances you won't even have the time to throw another one.
Like Armpit said, get IF or Shield , not both. Use IF if you wanna go 5+ or if you have 1 or 2 points unused when you reach lvl 30.
Ath. 2 is way too low, specially if you can reach 6 by sacrificing your IF. It will help you to run faster , get someone faster and help with avoiding arrows/bolts/thrown stuff at you.
Get 130 wpf in 2h and drop the shield , or get 130-140 wpf in one hand. Not 100 both. You better be fast in something than normal speed on 2. You'll get overspeed all the time and you'll end up just blocking without being able to attack much, and you'll be pretty slow, so easy to block/chamber.
Riding 4 .... Why ? You wanna be a cav or a horse thrower ? It seems to me that this overall build has flaws everywhere and not so many strong points (Hey, I'm here to help you, remember ?). If you go horse thrower, 4 is fine but you'll need better throwing skills. If you wanna be more like a cav, try to make it 5-6 to get much faster on a horse and surprise enemies than having them hearing you forever
If you'd sacrificed horse, and some IF you can go get yourself 8 converted and go get an extra PS / PT overall or more WPF with weapon master.
It's hard to tell you to try it and if it doesn't work, to retire it, because the only time you'll see if it's good is when you get really high level because of the overall way you built it.
Hope it helps