As far off as your laser's TC times must have been it wouldn't surprise me if your freq parameters are better set for loudspeakers
So do this: hit F3 to enter the parameter's menu, then click the 'laser control' tab, should look like the pic below-
--again, mimic my settings, and note that I've clicked on the "power map" to show my settings, yours should match, or be close-
and also note, the laser never "not" fires, even at zero power, so beware of that, because even at zero power it WILL mark painted or anodized aluminum, I've found that out the hard way more than once!
fcf.jpg
another note on this menu, with "fiber" checked, the PWM-freq setting and the power map are the ONLY options accessible, I didn't gray anything out, it's that way normally
And finally, the 200max and 20min aren't necessarily the actual freqs your machine is capable of making use of; doing some testing on my machine, I've found that 30khz is about the lowest, anything entered below 30 doesn't seem to be different, and 100khz is the upper limit. But, whatever you enter into the parameters, those numbers are allowed to be entered into the program, regardless of actual frequency limits...
hope all that made sense!