Acoustic center - Horn + CD - construction technique for horn out front?

[AllenB]

So maybe seeing this sort of wrapping in the phase result isn't the indicator I should be looking for.

Absolute wrapping, no. Relative wrapping, yes.

With properly timed measurements you must make identical delay adjustments to woofer and tweeter. The amount of delay is not important and makes no difference, adjust it until you can see it better.