I assume this is total Capital construction and operating costs to provide electricity at rates you quote.  If your costs are only construction than the monthly consumable cost on coal and NG are variables that will increase in the future.

In any case what the costs don't include are the carbon implications (that you show need to be included for parity with wind) but also the unseen costs of obtaining the coal and NG supply.  IMHO one of the reasons coal is so cheap is that the environmental impacts of coal mining are delayed way into the future.  Before 1981 or '82 strip mining operations had 7 years to return the land to similar vegetation as before mining.  Under the Reagan administration that time frame was delayed to (I think) 20 years.  This means a lot of natural weathering can occur on the spoils piles before they need to be re-vegetated. I remember this because I interviewed at a company that had a huge business in using plants to reclaim disturbed land.  They went bankrupt 5 years or so later because their entire business model disappeared.

The reason the 7 years was tough on strip miners is that you need specialized plants to be the first communities to establish.  Lots of heavy metals and acids that require phytosequestration to clean up the soil allowing conventional plants to grow.  After twenty years the soils are leeched and lots of stuff will grow.  The problem is, where does the leech water go?  It may run off or it may be contained and go down.  In all cases it is going to impact aquafers negatively.  These costs are then picked up by entities other than the miners. This keeps the cost of coal cheap but adds to the other problems of burning coal

Don't get me wrong, I think coal mining is a valid way to provide energy.  I am just of the opinion that it can be done in a much less ecologically destructive way, albeit at a higher cost.  But the rules and framework have to apply (and apply to all) or there is no incentive for the operations that want to do things right.  They have a lot of added costs without being able to ask more for the coal.  More likely the price for coal will go down if we allow the "most efficient" ways of extraction to be used without regard to down stream consequences.