Major INDI Library release v1.9.0 bring significant internal changes championed by @pawel-soja to modernize core INDI Library drivers and clients. New drivers for DeepSkyDad Flat Panel & Pegasus devices plus further improvements to PCM8 drivers.
I think I fixed my error: The guide scope was a tiny tiny bit loose. I changed the scope to a 50 mm f/3.5 finder which is sits more securely and now my RMS is around 0.5" - 0.75". I still use 2x bin, which seems to make a huge difference!