If EASY is being followed then 3 hour feeds are right for birth to about 4 months. Don't worry about what the box says, be guided by your baby's cues!
We followed a 3 hour EASY until about 3 ish months, but I had 2 refluxers so they needed 4 hour feeds at that point. Formula fed babies do sometimes need a 4 hour feed cycle before breastfed babies as formula takes longer to digest than breastmilk.
I would try the 3 hour feeds and see if you can get naps better, at 7 weeks the A time should be about 1 hour or a fraction over and A time is awake time (eyes open to eyes shut) and includes feeding time.
HTH!
Laura