kelly moms has a great article about getting off the supliments...
it can be done with a baby that young. it just takes some time
10 6 is a big baby sometimes it takes them longer to regain their birth weight then smaller babies.
adding more feeds is going to help, a baby with weight gain problems should be put to the breast as much as he is willing to nurse, some days it will be 12 times in 24 hours.
I don't think most moms with babies that are 2 weeks old can pump that much milk! More like 1 oz. You doing a great job!