Deanna, I think your weight loss is great - congrats! I know you're comparing your loss to others' and thinking that you should have lost more, but your rate works out to 100 pounds in a year - lower than your goal! Most people take at least a year to reach goal, so you're doing really well. Your starting weight was relatively low, so you wouldn't want to lose 100 pounds in six months like people with a higher starting weight, anyway, or you might go down too far.
If you think you could be losing more fat faster than you are already, ask yourself a few questions: Are you exercising enough? Are you drinking enough water? Are you following your surgeon's guidelines for eating for your stage post-op? If the answer to all of these is "yes", then there isn't anything for you to do to "step it up". If the answer to any one is "no", then you may want to talk to your surgeon or local support group about it and try to do more in that area.