It looks like you lowered the system bus speed so perhaps your NB speed and HT were lowered as well.
Problem is that you can't change the multi on your processor so overclocking isn't going to be ideal. That said, I would see what you could do to change the multi on the NB and HT.
Or better yet, save $120 and get a PH II 720 BE and have fun overclocking that bad boy. If stuck on AM2, then get the X4 940BE. I think they are running about $160 right now.
You really don't have a great overclocking part there I'm afraid. Although I can definitely see why you'd want faster than 2.1 Ghz!