I am Dr Mbong. It is recommended not to stop Gabapentin
abruptly and to decrease the doses slowly (just as you have been doing) before stopping it. The maintenance dose is 900-1800 mg and given the fact that you were on 2700 mg, you will need weeks to months of gradually reducing the dose to finally coming off the medication.
I know you are far from your physician but you will need to see a neurologist
to know what dosage decreases to do and for how long. Equally the dosage decreases to do, have to take into consideration, the indication for which the medication was prescribed and how much of it you need in order not to start having again the symptoms for which it was prescribed.
All the best & hope this helps, Dr Mbong