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3.  The fact that LJCP does not let you put in a value > 255 looks like a mistake that we need to fix in the test panel and config defaults section.  Where else do you see the problem and do you get an error or what happens?  I tried the LabVIEW example "U3 Firmware Counter with Debounce.vi", which adds 256 to the Value if you specify "Rising Edges" and it seems to work fine.

4.  Three ideas:  A.  Use 16-bit PWM so you can use a faster clock and still get 80 Hz PWM, B. Use the config defaults screen in LJCP to set the DAC to 8-bit mode, C.  Add a filter as mentioned in Section 2.7.