It seems to me that he doesn't have much day sleep - about 2-2.5h total, is that right? And he is 9 months? That doesn't seem to be a lot of sleep to me - mine all slept longer during the day at that age - so your ew problems might well be to do with ot. When mine were 9 months (if I remember rightly), we started the day between 6.30/7, first nap was 9-10, second nap was 12.15-2.15 and bedtime was between 6/6.30. dd1 slept through at this point, the other 2 needed at least one feed overnight, although I think that 9 months was about the time that I started to put my food down about nfs.
2 things: it seems to me that he is not sleeping enough during the day, and his day is actually quite long - 13h vs 12h that we would typically aim for. Is he generally very low sleep needs? Also, what type of baby is he?