Not best, but optimum Transmission?

I don't usually check the dipstick until the 2-3shift flares. Been doing that for 50 years. I build all my own transmissions, and I've never burned one up yet.
On occassion, I have overfilled them too. They just blow it out the vent. After a while it stops so I guess it found it's own level.
Kindof like my rad; it finds it's own level too.
And the P/S reservoir. She's nasty, about it tho.
Kindof like the oceans, the water always finds it's own flatness.