[JEE]

I have one with fine crosshairs for target shooting and I've very happy with it. I think that the duplex version would be just fine for hunting.

Here's fullchoke's review of the Ultra RM, although you may have already read it.
http://www.rimfirecentral.com/forums/showthread.php?t=161526&highlight=clearidge

So, this focus problem that you're experiencing, I'm assuming that it's at targets inside of 50 yards?

 

[JEE]

At at higher magnifcations the parallax error at ranges other than the scope's set range will become more noticeable, especially at shorter ranges.

The AO is the answer to bring your target in focus with your crosshairs, only it will be one more step that you'll have to contend with. I think this is the reason a lot of hunters prefer a fixed parallax as it's one less thing to deal with, but with aging eye's the need for extra magnification and an AO is understandable.