I have now almost finished optimising Tricky levels on the SMS. The current fastest projected completion is down at 40 minutes 23 seconds, though a more realistic target is below 45 to account for safety and human error. If you want to watch the playlist of optimised levels go here:
https://www.youtube.com/playlist?list=PLOTsjhPmEfJeElqnBUB6wPCj2k98ds9H8and if you think you see any flaws in my methodology please let me know!