When I try to make longer rip cuts I find the slight curve in the cut becomes a problem. I think it's there all along but too subtle to notice until 5 inches or so, and after a bit more it is a big problem. I've had this problem with both a vaughn brand pull saw and a much nicer but not high end saw from Japan Woodworker I got about a year back. Both blades are straight and have machine made impulse hardened teeth, so I suspect it is a matter of poor technique.
Any ideas? When I try and correct the problem I find the saw responds in nonintuitive ways and I get more of a dishing problem inside the cut than a correction of the problem.
I mentioned in my previous post about western saws that I was going to post about a similar problem with a Chinese bow saw - that's different. It has western style teeth and is probably a matter of setting the teeth correctly. I'll mess around with it before posting for help with that. This has me stumped, though.