Thanks everyone for your replies. I did some playing around with scraps..Feline Fanatic, you really made me think about those JN templates. It took a couple tries, but I think I figured this out... about how to use the actual paper piece to make a template, and to determine the angle I needed to cut the fabric. I'm heading back upstairs to sew more scraps and see if my templates work... I think before I was cutting regular over-sized 45 degree triangles with this block and it didn't give me the on grain edges I wanted. I'll report back later with some pics.
So many of you say it doesn't really matter if the edges are on bias, but these are large 12.5" blocks and lots of edge to stretch out of shape, as the quilt is sewn together. I'll be back.