Well I don't have much bowazon experience, but I did recently make a hardcore one. She only lasted till act two nightmare due to my lack of paying attention, but I did some reading up in bowazons because of her. So here are a few thoughts.
1: Most people seem to recommend not maxing Multishot. They say that 10 or so (plus skills from items, or up to 15 + skills from items depending on your comfort level) is all you really need. After a while the extra points become a waste cause those arrows don't have any real effect. I'm not sure if this is because they just get shot where no monsters are or of a bug where a monster can only get hit by 1 arrow (I think I read that somewhere) or what, but most seem to agree that it doesn't need to be maxed.
2: Pretty much a similiar thing with guided arrow. Nothing is wrong with maxing it, but the enhanced damage is rather small so the main benefit is the cheaper mana cost. With a little mana leach though and some skills from items 1 point in guided should be enough. In 1.09 more than one point is more useful because of the multiple hit pierce bug in which case the more enhanced damage the better. I'm still not sure maxing it is necessary though and if you are giving any thought to 1.10 where the pierce bug is fixed then it really isn't necessary.
3: If you are giving any thought to 1.10 then more points in valkyrie would be a good idea. They say that getting her up to level 17 makes her get elite items (I think thats what she gets then). So you should aim for that. I'm assuming that is 17 after skills from items, but I'm not sure.
4: dodge, evade, and avoid: I was planning on putting less poins in those for my amazon. The reasons I have heard for this is that a: you shouldn't be getting hit much anyway b: if you are running away then you don't want to get stuck in a dodging animation (I think this is about the evade one if I remember) c: I think I have heard that evade (I think its evade) is bugged so that if you get hit while dodging because of it you get locked in place or some such like that. Now being that we are talking hardcore I can understand more points here, but I just thought I would throw these points that I have heard out there and you can decide how much you want. : )
5: synergies: If you are giving any thought to 1.10 then you might want to consider putting some points in to cold arrow. I think thats the skill that is a damage synergy with freezing arrow.
Your build looks mostly built for 1.09, but I figured I would include those 1.10 tips as well. Now this is mostly just information I have gathered from reading in the past, so use your own judgement on things. It is just stuff to consider. I think I read alot of it at the
amazon basin in the bowazon forum though. So you can check there yourself and see what you can find.