Blackberry

I have been practicing FMQ on my Singer 301A but I can't seem to get the stitches just right. I first had trouble with the darning foot that I was using until I read on Sew-Classic's website (don't you just love that website) that the last needle thread guide would need to be removed for my foot to work properly so I did that and it did work much better but the stitches are still not right. They just don't look like the ones on my Singer 15-91. I figure someone in this department of QB would be able to point me in the right direction.