From the pics I say you should shorten it by a half inch. Your left shoulder looks to high and you're a bit locked out in your bow arm. A half inch shorter will help you drop that shoulder down and relax that bow arm. A half inch shorter will also help with shooting uphill/downhill as you will be able to keep your anchor better. That being said take this with a grain of salt. Hard to be a 100% accurate from just a couple of pics.