Could I get into Andover/Exeter

^^Yes, Peddie is big time in swimming!
In individual sports, as long as the coaching is good, the facilities are convenient, and the schedule allows you to work out most of the year, how competitive the program is may not matter as much as in a sport where your progress and "notability " will be determined by the quality of your team. Of course, it helps when your teammates can push you, but plenty of excellent swimmers and T&F stars come out of good, but not exceptional programs. Much less so for football, soccer, lax, etc.