Since you asked me in game to post, I have little knowledge of crossbowmen to be honest with you, but the build I would choose is the 15/27 one but I wouldn't put the wp into Crossbow, I would put them into 2 handed so that you can swing that mace of yours more effectively, i'm sure it'll increase your survivability (not that valour farmer needs to survive any longer)
Personally, that'll be my recommendation, get some wpf in melee and bat for the 15/27.