I'm a fellow newb myself, so I can't speak from an experience standpoint, but I can at least tell you that we booked our debut trip to Couples/Jamaica in April. The rates are reduced from 4/4 on, so you'll save money if you book based on the April/May timetable mentioned in your post. Just be forwarned tho that effective 4/1 thru 5/31 (or is it thru 6/30?), there is a moritorium on lobster in Jamaica, so it's likely there won't be any at the resort, with the possible exception of maybe some found in bisque or other dishes. There certainly won't be any fresh lobster. Personally, I think the availability of this delectable crustacean is a fairly silly reason by which to plan one's vacation, but some, including you, may feel it's that important.
As you continue to read in here, you will learn a great deal about the four Couples resorts and the experiences from many 'seasoned' vets, some who have vacationed with Couples literally dozens of times. Believe me, if this message board can't whet your appetite about all this place has to offer, nothing will. Have a great trip.
Reading is fundamental. It's just that for some, it's more mental than fun.