To answer your question, you are in an area with very few viable stations. Many of the stations that you ARE seeing are likely the result of tropospheric skip, and wouldn't be likely to be reliable 24/7. It does sound as if you are doing well with the 4228, and I believe that switching to an XG-91 won't do a lot for your UHF, and would likely hurt your existing VHF reception. Frankly, you sound as if you are doing about as well as could be possibly expected with what you have.
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