Aaron,
I don't see much of an issue with slightly taller stands. I did this at my last home with no problems.
Many folks maintain they can hear the precise point where the speaker is correctly phased. I can't. Sure, if the phase is way out of whack, there are obvious cancellations. I can hear these and I hope others can too. However, if you are in the "zone" around the midwoofer/tweeter, you will be just fine. I was very happy with very tall stands for a couple years. I think my stands were 24" tall too.
Or, you can build your 1801s in a floorstanding configuration and put the tweeter about 40" high.