I emailed Lear asking for help - they sent a PDF, Alternative Programming Instructions for 300 and 310 MHZ Units. I followed the Alternative Stanley 310 MHZ Units instructions and EVERYTHING WORKS BEAUTIFULLY NOW. Range is 2-3 houses away!
1. Follow normal programming instructions, but
2. When holding desired button to program (last step) press and hold for 6 seconds and release - hold for at least 6 seconds and do not release even if the door moves b4 6 seconds are up.
I initially held for LONGER than 6 seconds (maybe 8?) and all 3 light started blinking, it did not work.. (all 3 lights rapidly blinking, maybe timed out), but on 2nd try held for just 6 seconds (garage door started moving in around 3), then let go.
The other alternative instructions (which I didn't try, since this one worked) was to:
1. Follow normal programming.
2. When holding desired button press and hold for just 1 second and release (< 3 seconds).