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Uploaded on Oct 28, 2011
Sounds like old age, amirite? After a fair bit of experimentation, I figured out the one location on a curve that hurts you and the two locations on curves that slow you down. This data gathered on version 1.7.3 - your mileage may vary.
In further testing, I'm finding that (depending on who knows what) blocks on the outer curve can cause pain, too. I believe the lower inner block might cause pain. Nowadays I just clear out all pairs on the four outer blocks and the pain on the inner.