FInally figured out the issues of thin features, and I'm printing my first (what appears will be) successful print with Creator. Some observations:
+ My printer runs more quietly with Creator output. The steppers don't "grind" - much, much more quiet.
+ My infill is nicer with Creator. Same printer, same filament, same bed level, same temps, same everything. But Creator's is smoother and less fogged with natural PLA. Maybe the environmental conditions just happened to be perfect
+ Creator seems to have some tweaks for structural issues. It's hard to describe, but I have projecting features on my model, and Creator seems to create an infill pattern so that there'll be more strength. I like it.
Cheers, and thanks.