Death a few things here that might give issues. When flashed via recovery the radio.img is copied to /cache and then flashed from there so you DO NOT want to wipe after flash that might be why the version isn't updating as you are wiping it before its flashed. The radio is flashed after the reboot out of recovery. You reboot fully and then you can go back to recovery and wipe cache. Dalvik cache doesn't matter at all here. Just a warning a bad radio flash or a botched one will 100% irreverasably brick your phone and is the single most dangerous thing you can do to it. Triple check your md5sum before flashing and consider is it worth the risk if it is i suggest doing the method below instead of via recovery. Radios flashed from optimus recoveries I have 1 report of bricking but am unsure if user error caused it.
The preferred and safest way to flash a radio is via fastboot:
fastboot flash radio (radio.img name here)