Got it figured out. I drained the tank to empty through an outdoor faucet, removed the plug to release any residual air pressure (just a puff), reinstalled the plug, and turned the pump back on. Water level is now at 49" and I am sure I won't have any more air in my lines after this.
This post talks about the problem I was having a few years ago - http://www.terrylove.com/forums/show...g-storage-tank
The air issue would come and go, but lately had gotten to be more consistent. Probably have some defective components/valves in the bleed system (if it exists), but if this works for any length of time, it only takes about 15 minutes to correct.