I'm currently roling a similar build and really enjoying it. I did a lot of skip the fun for the sake of SCIENCE! and have decided on an all rounder. I have 1 in PT and 3 PD I would go xbow instead on my next run through.
As far as I can tell from using a character calculator which I can't find anymore. wpf kicks in .5 dmg bonus for every 15 points. So 105 is optimal but 104 is a waist of a good number of points. In other words 1h should come down to 105 and 2h should come up to 90.
My preference is to go 1h throw and shooty. When I'm on a horse I couch because I find poking a disdainful activity that is carried out by revolting peasants. Men couch wankers poke. WPF has an effect on a good couch but I didn't really notice much of a difference between 30 and 75 and so I just drop 30 in because its cheap and does the job for me.