24/12 archer with khergit was great fun for me, don't need the 15 it only adds 1 more athletics and 7-8 more wpf ebcause of how expensive it is at that level, this allows you to have the 8 powerstrike as well as 5 IF, with your 8 pd, 4 ath, 4 wm (69 hitpoints you survive a lot as an archer). I don't think some of these people posting realize just how much powerdraw adds to shoot speed, you are shooting a khergit with 8 powerdraw like you would a strongbow with 6 powerdraw. It goes far, shoots even faster and most of all it hits like a tank. One of my more enjoyable builds. Just use a side sword or other really fast 1 her, maybe katana (don't like how the animations work on it though) and you can hurta lot with 8 powerstrike and still swing fast with 1 wpf. Definitely give it a try.
And you can always switch to different bows with this build and try them out, but the build itself is great, there is a lot going for strength build archers.