@joshuabarksatlcs 

What did you end up finding out?

I have the same exact issue. i have been looking for the answer on this for hours and i cannot find a straight answer

But It makes sense that the 1341 credit also applies to SE tax applied in a previous year for the following reason:

Publication 525 page 37 - bottom right hand corner: It does not refer to SE tax but it does say that W2 employees that had a clawback of wages and claimed section 1341 credit for tax, can ALSO apply for a refund of FICA from the employer or alternatively file form 843 to get that money back. So my reasoning goes that if in a  W2-related clawback you can claim back the FICA paid, then in a Schedule C-related clawback, you can also claim back the SE Tax.

That's as close as i get with it. Input?