Don't feel the need to repeat every hour until you hit 1,800mg. I wasn't suggesting you take that much on the first day. Take the initial dose with a fatty snack like peanut butter, wait an hour to two hours and add 300mg on top with another fatty snack. Wait a few hours after that to see how you feel and if you feel the need add another dose. You don't want to chase Gabapentin in the hopes it'll take away all your w/d. It isn't going to mask a lot of the symptoms and if you start stacking it fast you'll find yourself very, very high.
Gabapentin when staggered can cause heavy sedation, closed eye visuals, and full on near psychedelic/disassociate effects. I do find them pleasant but if you aren't expecting this it can be very scary. It comes on very suddenly and you might find yourself unable to walk. You'll be wobbling around like a drunk if you push it too far. Just go slow and see how you feel before jumping into the deep end of the pool. I've taken more than 1,800mg in a day but I would never suggest it to someone new to Gabapentin. Since you're in withdrawal I'm worried it might cause you harm if you jump into the deep end with it like that. I'm pretty sure I caused a seizure by taking a heavy staggered dose of Gabapentin in withdrawal one time. I can't be sure because I slept through it but all the symptoms lead me to believe that is what happened.