As a possible alternate method, I just used a flagship myself. I don't know if you get bonuses to your score with a bomber but by using a flagship and being accurate, I got an extra 5,405,847 points with my in-game score being 6,778,750. These added up and put me well over the 10,000,000 mark.
25K - June 3, 2009
50K - June 11, 2010