Deductions & credits

I have two form 8829's, split correctly.  One business I am closing this year or next but would hope to still get the deduction carried forward.  I though that was possible since schedule C's businesses are consolidated, but I am ignorant here.  

 

Separately, if the % of the home used for the deduction business is incorrect for last year due to an error of entering the square footage of the home is it best to amend last years form or just correct it this year?