No calibration to 1 and 5, just as shippedHave you calibrated your 1 and 5 watt levels out of curiosity? I will probably revert it to the original version, but keep a secondary build with my custom offsets, which appear to be more accurate according to my meter. Do you have a meter you could check your levels with?
As for the mic gain, there is an option for it. Menu > Options > DMR Mic > 12dB
Maybe you missed it?
Oh and hotspots are deaf. I wouldn't expect someone to be able to be heard at these lower powers on the hotspot. As I mentioned, I can hit my repeater 17 miles away, not line of sight, and with the 10mw setting, with a good RSSI of -110. But the hotspot can't hear it at all. If you test on another radio, or to a repeater using a base antenna, you'll see it really is a tiny fraction of power but does get out.
Checking output via reception by hotspot
Mic gain stopped at 6dB, no 12dB available