Then you are doing pretty darn good if you ask me!  Your average to an accepted share should have doubled, but it did not!  The VALUE of each of those shares did value though.  They used to be worth 512, now they are worth 1024.  So for 10 minutes at 512 you were getting 4,096 (* .08 per min) and now at 1024 you are getting 5,120 (* .05 per min).

Obviously those number are merely estimates based on your estimates and not including luck or anything else.  They do point out one aspect that so many people seem to be missing.  The fact that an accepted share is now worth double what it used to be.