Fiddled with it today and ended up changing several things slightly, and I think I have a pretty good config the way things sit now...
Loosened the bottom foot strap on the Stryder, which made the ascender sit angled forward a little more (rope channel more vertical). Really helped the rope feeding, and I didn't have a single kick-out (whatever it is called when the rope simply slides through the device without being grabbed, but doesn't come out of the device). So, that helped. Also tried to keep foot slightly angled forward.
The other thing I spent a little time "tuning" - although it will probably bear a little more tuning in the future - were the relationships between my shoulder tender (Walmart webbing with a plastic buckle on it, clipped back to the red ring in the center of the TM Lite), SAKA mini foot-knee strap length, and elastic length.
I'd been running the elastic band tripled instead of single or doubled. Changed it to doubled and lengthened the elastic, and then shortened the webbing between foot loop and knee ascender. The net effect was that...
1) when I was standing upright on the knee ascender, the shoulder tender could pull my bridge higher up the rope so there was less setback when weighing into my harness,
2) the knee ascender was lower on my leg and seemed to be father away from the harness leg loops and pants material that could cause drag on it, and
3) possibly the most noticable outcome, the weight on the shoulder tender was much less because it wasn't having to fight against the tripled strands of elastic (knee ascender is tended from RR's carabiner).
The whole string (from foot loop up to shoulder tender) is now configured such that when my knee ascender leg is juuuust shy of full extension/knee-locked, the elastic is maxed out, and when leg is bent at knee to the extent that it would be just before taking a step on the knee ascender side, the knee ascender itself isn't in danger of touching my harness's leg loops or anything else.
Just an update, for anyone who cares and/or might benefit from a newb's learning process.