Yes, it can be more in total recoil, but the impulse is different. The .357SIG feels much sharper in recoil than the .40S&W. That could be enough to make a difference on moving the slide back. If the slide is catching at the peak of recoil with the .357SIG because it hasn't moved back as far as it would be at the peak of recoil energy in the .40S&W, that could make all the difference.
As I mentioned, this is just speculation on my part and is what I would look at if I were having this problem.