At 2-3mos, 1hr-15min of awake time sounds about right. Have you tried simply moving her last bottle and bedtime up by 15-20 minutes? That would put the awake time at 1hr-15min. We've always had a shorter interval at the end of the day.
As for catnapping in the Baby Bjorn, we were fortunate that dd is kind of scrawny (she's 9mos and only 15lbs). You need to do what works for you. We started it when dd was maybe 5-6wks (as soon as she was big enough to ride in the carrier). She was a horrible napper, and by getting a catnap in her in the early evening, she wasn't so overtired at bedtime.
I guess my point is that it's not critical that the catnap be a crib nap. It will be the first nap you drop. However, if you get 1hr-15min in the crib, however fitfully, I'd be inclined to move up bedtime a bit before messing with the nap.