I wasn't a fan of Gabapentin. I was on ir for about six months doing 300mg/day like you. I don't think it provided much relief for my chemo-related neuropathy but it sure me rather foggy-headed and loopy.
My doc told me to taper off from it and not to do it cold turkey. I reduced my dosage by 100mg every four days. I experienced some bad night sweats and some sleepless night withdrawals for about a week. It took a couple of weeks for my head to clear. The neuropathy is still there.
I'm going to stick to using lotions and potions on my feet, although I'm still trying to find the right one after three years. FYI, my new favorite is Mama Bear Oasis. I've been using it for about a month and it has provided me with some relief. The roll-on version makes it very easy to apply. I hope it continues to work.