You sound like you do enough...i.e the hours walk every day ....that is such an effort for anyone with a child....i think your doing more than what most mothers would do...including me !!!
Ive always found b/f seems to get rid of the baby fat, but those wobbly jelly bits i find doing 10 mins of sit ups at night before i go to bed helped - i havent done that with this baby (7 months), and TBH im kinda comfortable with my body ATM. But when i did have DD#1, i remember to tone my belly a bit, i used to watch tele lying on the floor, and did 10 sit ups every night. I could realllly notice the difference.

Also, remember, bubs is only 6 mths old....you're body has gone thru a lot to produce this little thing...it may just take a little longer than you anticipated....GL !!!YOu sound pretty motivated....