Idle too low low to charge

[Greasey Harley]

I recently did some upgrades to the ol truck and ended up draining the battery while testing all the systems. Then I warmed it up and took a screwdriver to the 2jet. got it idling real good, nice and smooth, about 550 rpms, sweet... Not so much.
At 550rip'ems the alternator puts out 11.50 volts with the radio on low and the heater on. With a minimal charge on the battery and a 10 minute warm up this morning the battery was at a deficet. Drove 4 miles to work ( not enough to charge) and my battery was dead after work. Good thing I parked on a hill. Anyways, after a little head scratching, I think I have it figured out. --->I tuned the carb too dang good. I readjusted the Idle up around 650rpm, the alternator stabilized at 13.2v with the radio on and the heater on high, 13.1v if the park lights are on too. Bummer, the thing sounded sweet at a 550 rpm.