"so i guess my question is, is g13 x widow a bad yielder? "
i actually have grown some of these. i killed most seedlings because of errors, but 3 phenos finished. a 'widow'-type pheno; smallish yield (personal fav though...), ...a mixed-hybrid pheno, decent yield, but i didn't fancy the smoke (my friends did though...) and a good yielding, but average-looking, leafy, kind-of-middle of the road-type smoke -mainly g13/sk leaning pheno.
so, from someone who's actually grown them, you will find yield.
you will definitely find good smoke, regardless of yield...
how many seeds is in a gram?? you'll get something worthwhile methinks... good luck
cR