OK, I've got it now:
So then instead of the word "Technically" you should have said to @rroscher "Historically, the only Narrow-band frequencies allotted to GMRS are the 467MHz interstitials -- and those are 0.5W ERP; the original GMRS interstitials on 462MHz are Wideband and permitted up to 5W ERP."
Because: Technically, it is legal to use NFM on all of the GMRS frequencies, including the Repeater Input Channels and as@gortex2has stated on this Forum several times: his personal repeaters are programmed just that way - NFM, for the personal use of his family with other NFM GMRS radios.
? <--? ?
So that the question to @rroscher (in addition to @OffRoaderX's question about Channels vs. VFO) is: are you using the GM-30 programming software to makes these changes to HIGH power, or doing it just on the keypad?
AND there was a firmware update to the GM-30 that may have addressed his problem; either:
GM30_APP_20210306.bin
GM30_APP_20210403.bin and/or
GM30_APP_20210615.bin
The most recent of which is available on the Radioddity Support Page for the GM-30.