Power, sounds to me like you need resolution. For resolution, you should have looked at a 50mm scope.

You can have the best glass in the world with 100% index matching coatings, but if they are 20mm, even a cheap scope with huge objective would have better resolution.

I myself would never rely on my gun scope to ID animals. Just think its unsafe. Been scoped too many times. Didn't like it. I say id with a great set of binocs and then use your gun and scope to shoot the animal.