Nice work! I do outdoor measurements myself and I can appreciate what a pain in the rear it is. I drag my amps and stuff outside so that's a bit easier than running cables everywhere. To make sure I understand your setup: speaker and mic at 40" off the ground with the mic at 2m (78.74")? Is that 40" the location of the cd exit? That would only give you about 2.5ms of clean impulse for the wg and a bit less for the woofer since it's closer to the ground.....it definitely looks to me like you've got some reflections in your data.
Hopefully I just misunderstood your setup and I'm not the guy raining on your parade . I generally try to keep the mic distance equal to the distance to the ground to maximize the time with no reflections. A 40" mic distance should get about 3.6ms of clean data which is about what I can get in my living room.
Another method for eq'ing a cd horn is to cut the midrange frequencies where you see gain from the device, rather than boosting hf. In the digital realm it's all the same, but you could probably get away with a little less digital attenuation on the tweeter channel if it's needed.