I got a warranty replacement BL touch that was incorrectly wired. Just a heads up. The attached picture was the correct "pin-out" in relation to the board.
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RE: Sliced model speeds don't match settings
Have you checked your "Cooling" section on the speed tab? Just did a test slice of a 30x30x30 cube and it's slower than "ordered". I'm attributing this to the minimum layer time and minimum print speed.
-Real time while typing test:
Changed the minimum layer time to 1 sec for the same model with the same slice settings except as indicated and all speeds are as "ordered".
MC is trying to give you printer adequate cooling time, just change the minimum layer time and speed and you should be good to go. Hope this helps.