Hey well done. You are doing great. and you've found this place
So the napping time is very short. Is he really having 2x15 min naps the whole day? He's banking up milk well in the evening, so maybe really doesn't need the night feed at all. Does he sleep all night other than that one wake-up. You could try subbing the milk for water in his night bottle, and see if he goes back to sleep without a milk feed. If not, then we'll think of something else.
If you just work on your 845am bottle time for now, maybe we can move that as a good EASY becomes established. If he is taking good milk feeds, try not to give another bottle before 3.5 hours (so after 12noon) for the next bottle. The EASY schedule is constantly evolving, so you wont stay at one time for very long, so for now....
try morning bottle, then activity, then a sleep at about 10.30, then if a short sleep, a bit more activity until 12 (ish). then another bottle and so on through the day....does that make sense?