I did my first test on my CRG today and I do like the 219 chain over the 35. It felt smoother and I can feel my tired old clone motor start to pull a little quicker. I don’t have a 219 skip tooth yet. I’m trying to decide if I should modify a regular sprocket or just break down and buy one.
But, I like the 219 for all the reasons both of you mentioned. Less mass more links= less friction. The only thing holding me back is finding a 219 chain long enough to put on my daughter Kosmic/lo206.