If its any consilation my ds, also bf and on a 4hr routine, df at 10.30 has on average 2 wakings a night too. We're starting to get the odd night where he will have the one nw between 3-4am which will hopefully get more and more often.
My older ds started sttn at 4 months, reguarly by 5 and my older dd didnt drop the last night feed til she was just under 6 months, your doin great.
I'm gonna try an experiment if your interested, to get up 30 mins/1hr before de's first nw and feed him then. I seem to remember someone suggesting it to me with dd1 and I think that was how we got rid of that last nw?
I'll let you know, could be the new W2s! sorry feeling a bit manic.