I think 155.430 is the P25 alternate control channel for MOSWIN in Troop E (Poplar Bluff), unless it has changed recently.
I have been very busy for the last year with other projects and unless tornadoes were around I have not been using my scanners, however, after reading this tread I realized that I almost never heard Butler County SO compared to Wayne & Dunklin Counties which were pretty active. So maybe they have moved to DMR. Unfortunately, I am not able to find what frequency that moved to.
Sorry I cannot be of more help.