First, EASY timelines are guidelines not absolute rules. I felt that if my EASY only varied 30 min, that was a pretty good day. Newborns can eat any where from 2-3 hours, so if he is giving hunger cues at 2.5 hours, go ahead and feed. Always feed a hungry baby, just make sure it is a full feed, not a snack.
Second, I look at overall time slept during the day, not each individual nap. If his first nap is cut short, I would let the next one go a little longer.
Third, EASY is a style of parenting not a sted fast schedule. Change it to fit your needs. As long as he is Eating first, then Activity, then Sleep, you are still following EASY. If he doesn't need to have 15 min to fall asleep use that time for bonding, baby massage, looking at pictures, etc. Just make sure you give him ample wind down time so he will still fall asleep nicely for you.
Sounds like you are doing wondefully! Well done mummy!