That sounds like the type of results I am getting. I think there's something different here with some of our hardware. The light is pulsing on and off, but I can't visually make out much, if any, differentiation between power levels other than high and low. It definitely is not for a lack of trying. I've used every combination of speed, power, and resolution I can come up with.
Where did you get your laser kit? I have an A5 2000mw kit from Gearbest, and it came with an L5 board.