Does anyone know what to do for trades and fees that start 8 digits after the decimal?

 
There's some exchanges that gives you fees and trades that sometimes don't start until after the 8th decimal like coinsmarkets.com

I'm also tearing my hair out because some exchanges are clearly using some type of rounding which makes it so I'm getting fractions of various coins left over that I shouldn't have left over.

I think I can only bundle so many trades legally with the government ruling that trades within exchanges are taxable.


What can I do beyond doing this on paper?  Please help someone.

If cointracking made it so you could enter 26+ digits after the decimal without rounding that would be amazing.