I personally think B tends to oversimplify Nelson tuning. There was an entire thread about this...hold on a sec. I'll see if I can dig it up. https://www.mcarterbrown.com/forums/a...ip-12gm-2.html
Here...Frink ended up changing my mind about efficiency. I was convinced in-grip had to be better, but that didn't seem to be the case when people started talking about their in-grip shot counts. There's the whole issue of liquid siphoning directly to the cupseal area. This post in particular.