Hello Toddalin
In my mind smoothest frequency response. I don't worry about time alignment. None of my systems I own or ever have owned have been TA with the exception of My 811C clone I used as a center. That's the only stand out.
You also have your crossover in the mix not just physical spacing both vertical and horizontal.
But time alignment is not critical. It's the exception and not the rule.
I would just do what you have been doing. I am guessing you are using the sweet spot as your microphone position and setting them up that way or 1 meter both? I would do 1 meter and sweet spot. Microphone placement will change things.
That's how I did mine back in day before I had a measurement set-up. Your happy with your results so that's what matters.
Rob