Ok, Squad. I'm legitimately impressed and I thought you should know it.
I just updated to 1.2.0.1532, and my orbit is completely stable. Talk about customer service. Talk about support. Talk about responsiveness, troubleshooting skills, physics genius. I expected to at least have to wait for the official 1.2 release. I think my 2400 hours already express how impressed I am with your game, but this issue has me eminently impressed by your development team. Way to go. Thank you for fixing this. My Kerbals' journeys continue.