Since I can't update the spreadsheet yet, I'll post here. I traded one of the parents for a 6 IV Spanish Ditto (non-Kalos Born) in the middle of my previous "streak", but I don't think it will ruin the results.
As for what's important, another batch without a shiny in sight, which leaves me at 750 eggs hatched, and no shiny Charmander yet =/
Oh well, 750 eggs is just bad luck. Look on the bright side at least it isn't the 1800 I spent on Treecko and still got nothing. Also changing parents won't affect it as it isn't a chain, each egg has the exact same odds of hatching shiny