i have never had to use carriage returns before when using Kramer.
sometimes if operation is erratic i have inserted upto an 8ms delay between characters to make things more reliable, but only do this if you have an issue.

just another point to help you along your way the ASCII code 'L 1AE5' is for video 1, not YC-1.

ratherthan have a 5 second delay move the power string to earlier in the macro, and leave the YC-1 string to the last command in the macro. possibly still use a couple of second delay immediately before it, but it meens that the other commands are run with out delay.

unrelated, how are you trying to control the screen to come down?