If your current pump is 1 HP uprate, then the 3/4 HP Full Rated Northstar may still be too big. When replacing a pump, it is a good idea to compare braking HP (BHP) of the pumps. The BHP for the full rated Northstar = 3/4 HP * 1.85 SF = 1.4 BHP.

As an alternative you may want to consider is a 3/4 or 1 HP two speed pump. That way you can run it on high for the spillover and jets but on low most of the time for circulation and save a ton of money on your power bills.

One other thing to note is that when you change to a pump with a lower BHP, the head will drop as well. So a 1/2 HP pump will have a head of closer to 32 feet. A good estimate is:

New Head = Old Head * (New BHP/ Old BHP) ^ (2/3)