Out of curiosity - how old is the Pulse? Is it the version 1.2? If not, it may not operate correctly utilizing the high speed SSR mode on the M12. If it is the newest version, while in the custom programming mode you will have 19 choices (the trans/receiver rate selection will be the red and green lights)

IF you don't have the newer version, you should be able to change the M12 out of the high speed setup for the next one down and see corrected performance.

Wilde