No experience, but the way it's worded seems straightforward.
r1 and r2 are a dummy-check to keep your set point reasonable. As long as r1 < sp < r2, you're good. If you need to move sp outside that range you'll need to adjust.
c2 and c3 are the on/off times for the failure mode where the probe is disconnected or broken. 5 min on, 5 min off isn't going to be great for a compressor, and since you're running a freezer would probably result in it freezing. I'd change c3 to 45 min, since that's what seems to be working for you.
c4 is the minimum time the compressor will stay on. I don't see any reason to increase it.
c5 is the minimum time between compressor cycles. As above, 10 min is pretty short but it seems unlikely you'll ever cycle it that much.