@TOG99, I thought for sure that I would need to use a null pixel or data signal booster of some kind (at least for the mega tree (since it’s the longest run from the source). But it turns out that I didn’t have this issue. I guess the Cat6 cabling was surprisingly good at carrying data the longer distances that I needed. I did run into a very frustrating data-related problem with the icicles though. I kept getting lots of flickering when the brightness was up more than 40% or so. I had a lengthy back-and-forth discussion with a lot of helpful people on the forum here about it:
Ultimately it turned out that a small resistor on the data line made the flickering go away.
Other than that, I was fortunate enough not to run into the low data signal issues that many people seem to have.