What happens if you set your upper limit to 0.51 or 0.55 Dion? I certainly didn't program it with my REV axis checkbox checked....now that being said, some hardware IS indeed differing in these axis ranges and that is the very reason the REV checkbox exists....and if it turns out you need to check REV and I don't with my hardware, then who says who's hardware "gets the normal behavior", etc. If my hardware axis is backwards, I simply check "Rev axis" and move on.
I'm out of town and do not have my hardware for testing
TK