Update:
The bags deploy easily and opened beautifully - it's surprising how they rotate/flutter like windsocks on a gusty day - there's obviously very turbulent flow in that area of the keel at idle speed! Who knew? I was expecting nice laminar flow for some reason. They actually "stick out" - even the front edges of the bags nearest the keel don't appear to touch it.
2.5 mph without the bags, 1.5 mph with the bags deployed. Perfect for what I want to do.
The Skegosaurus does exactly what I want - full steering capability without applying power to the xi5 prop. But when not in Heading Lock mode it's forward biased meaning the motor wants to rotate toward reverse (the motor is mounted quite far forward on the shaft on an xi5). So I think I have some skeg trimming to do to "balance" the skeg area to be centered on the shaft. Under Heading Lock the active turning motor works to prevent this rotation but that's not optimal for the turning motor/gears and battery usage IMO.
The xi5 - unlike my old Terrova - does not really like being pushed by the main motor. In Heading Lock mode it seems very "darty"... constantly over-adjusting and being quite spazzy - whether the Skegosaurus is installed or not. Is mine wonky or do all xi5s behave this way? This constantly making pretty drastic adjustments behavior is irritating as all get out. It doesn't make them for long so the course stays about on target but good golly is it spazzy.
I calibrated the keel alignment and did the "drive in two circles" thing successfully so I don't think it's a calibration issue?
The xi5 Anchor feature holds really well/tight - but again - holy hyperactive compared to the Terrova - but I suppose this is how it gets the job done so much better.
The Jog feature is going to get a major friggin workout - that feature is made for how I work shorelines whether pitching or slip bobbering. That feature alone was worth the switch. The Gateway system is awesome - full control and info displayed along side or above charts, graphs, fishing camera, etc.
Aside from wonky main motor pushing behavior I am thrilled. I hope to improve that behavior somehow.