Now my spa is another story. Abut 40 gallons and it has a 2 HP pump and 1.5" lines. Sounds like a bad match. I assume that a variable speed pump will be good here because I can run it at its lowest setting for normal circulation and then up to 2 HP for actual use.
Ok now the spa. yes a 2 speed is the trick saves big money and again the sta rite is the pump, prob is cost. but i just saved you a bunch on on the other pump so you are all set with pumps that will last a lifetime if you take care of them. i have seen these pumps 40 years old. had one in from 1972 the other day . the pump that changed the pool industry !