You could move from 23 mhz to say 38 mhz since most of your noise is down low. This isn't a solution but it could help a little until you decide what you want to do. Sometimes the slightest change for the better makes all the difference. Thats easy to change and won't hurt to try.
This is CABL.com posting #283659. Tiny Link: cabl.co/mblXj