Just a thought. I suspect your radio is putting out close to 50w, it's just that you're measuring over the air instead of using a dummy load. Your meter isn't very accurate either as with all these consumer grade meters. I'm not knocking your equipment, but if you're not using a Bird 43 or equivalent into an accurate 50 ohm dummy load you can read anything but what the radio is really putting out. I suspect your radio is fairly close to spec.