After owning a Kowa I think you will be disappointed with the Ultima. Spend the 198 bucks and get the 50x eyepiece or shell out a few more dollars and get the 20-60x eye piece. The 100mm objective won't make your target any clearer, but it will allow more light to enter the scope. Since the optics in the ultima can't compare to those of the Kowa overall picture quality will not be any better which is why I vote for the new eyepiece. That being said, I am pretty surprised you can't make out your rounds at 300 yards with the 27x eyepiece you already have.
Unless you are spotting with a lazy eye or something the picture quality will not be any better looking through a set of binos. The image you see through your scope using your dominate eye is as good as the image you will see with both eyes open looking through a set of binos with comparable optics.