We mostly answer direct product questions but here are few things to try.
Regarding the measurements at different distances. You could design the filtering with the measurements you have then verify/adjust the relative driver levels later with measurements at a common distance outside (where there are no walls). Or take some new, gated measurements outside. I’d also suggest talking some off-axis measurements to help choose a crossover point where the drivers beam-width’s are roughly similar. Floyd Toole has published on the topic of subjective preference for loudspeakers with well-controlled directivity that varies smoothly over frequency.