It can't be coincidence though that one instance successfully found 6 blocks and the other 2 have had all of theirs rejected. I did notice that the successful one has 10 connections and the other two have 5 and 7, is there a way to manually increase this on windows?
I do not even know what does connections actually represent. I do not get over 2-3 though. What do those mean anyway? how come yours is 10 while mine is 2? :-)