Have you stopped BF completely? If so, how much formula in total does he get in 24 hrs? If not, are you wanting to stop BFing?
Given the amount he is taking overnight, he isn't waking from hunger.
I do think it's more likely a routine issue or possibly teething related. Could you post your typical day in EAS format?
Like this:
E 7am
A
S 10-12pm
etc...