David,

These flight/landing cycles, are probably what got your engines safely through the break-in. But I think a controlled, test stand break-in is still preferable. Allowing the engine to cool completely between short runs, gets the annealing done properly, within about two hours; not 2-3 weekends, as you would get when doing it your way.

The modern, CNC produced engine will survive even if it is not treated carefully, but is it the correct way?

I would prefer George Aldrich's words, to the LHS guy's words, although the engine will probably survive both ways.
I believe it will have a longer life after a George Aldrich type break-in.