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Alright since I've done alot of cloning I'm going to run into stuff about cloning to help new people here.
1) 4.5 is pretty much the maximum of the cloning window. Personally I've had successful clones as low as 3.5 try to aim for around 4 seconds and it should give more successful clones.
2. Error screens. White error screen = too late, straight to black = too early, communicating then into black screen = perfect timing! Don't get disheartened if you get the right timing and it doesn't clone, cloning doesn't work 100% of the time!
3) Once you get used to the timing and no longer need the error screens to help out with it, turn off the second DS 3 seconds after you have turned off the first one. It'll allow you to clone without the error messages and is a little bit faster (Plus I've been told it has a higher success rate)
4.If you're getting stressed out about too many fails in a row just take a break! People will be happy to wait for you and you don't need to push yourself hard, plus the more you stress the harder it is to get the timing right.
I hope this is helpful for people trying to learn how to clone, the video kind of doesn't go over everything