d'oh! that'll teach me not to do a 'does this make sense check' before I posted.
I foolishly assumed that, since they quoted FP in fahrenheit, that all the figures were in F. But they aren't; they're in Celcius. So:
Ethanol: mp -130C, bp 78C, fp 8C
2-Propanol: mp -90C, bp 82C, fp 11C
Since 2-propanol is bigger and has more C, I wouldn't be surprised if it burns a bit sootier.