TomD
The most likely reason to have a jam is because you have more blade sticking out, than you have space for the shaving going through. I measured a plane from my shop, an ECE, that does good work in fairly difficult wood. I chose it because it works and is commercial, they presumably know what average users and average wood requires from a finishing plane. I had installed a blue steel blade in it, and I had apparently not changed the mouth setting from wide open as it came in the box. That mouth opening, which is adjustable was, set at 50 thou.

Many of my planes have tighter mouths than that, but it's a number.

There are other possibles causes, breaker that is too close, undercut, poor fit, not smooth. Rough or overly closed escapements. Wedges, sorta same list as breakers. Lots of little things, but normally it is obvious from the region the clog starts in. Wood can also be a problem, as some collapse or fragment a little more than other. Obviously you expect to get around these problems with design. But the easier woods are easier to start with, like pine, or cherry, or maple.