I ramped my gabapentin consumption up to 2400 mg over time. My current schedule is this:

9am - 1 tab (600 mg) gabapentin
3pm - 1.5 tab (900 mg) gabapentin
9pm - 1.5 tab (900 mg) gabapentin and 1 cap (25 mg) nortriptyline

I do take a bunch of supplements including magnesium, which I take at noon so it doesn't interfere with gabapentin absorption.

I also watch the temperature of my shower, because it can set off burning all over my body.