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If there are takeoff mins published, then you gotta follow them.
Depends entirely on what your specific Ops Specs and/or MSpecs say. They are controlling. Mine say that higher-than-standard mins on the chart must be followed, but for lower-than-standard, I'm given a table to work out my own takeoff mins.
You didn't mention if what are flying with how many engines. Standard minimums for two engines or less is 1 mile or 5000' rvr, under part 135. two engines or more is 1/2 mile or 2400' rvr. In my ops specs (c079) it specifies exactly under what conditions you can takeoff in less than standard, which for me is 1mile since I fly two engines. I can go as low as 600' rvr if I can meet the conditions under C079.
Under part 91 as I recall you can takeoff with zero if you are crazy enough to do it.