Hi. I have been on gabepentin since 09. I started low like you, but as soon as I could tolerate the side effects I double it. I am now on 600mg 3 times a day and 1200 at bed. The biggest side effect I have noted is brain fog and weight gain.

If you find it is working I would stick with it. Why change something that works? Also I got relief from blocks as well. My dr. did a serious of 3, one week apart and that really helped.

Good luck!