I have an old 1.5 HP single speed high-flow Centurion motor on a CHII-N1-1 Pac-Fab pump. The motor has always been too big -- designed for a water feature that we never added. Pool equipment guys have told me it is oversized for my 25,000 gallon gunnite pool and 62 GPM sand filter. I've kept up the pool easily with the TFP formula, even though the main drain has never worked (2 skimmers, 2 returns) I've kept the pump maintained with occasional part replacements, and it's held up well for 18 years. I'm finally upgrading -- adding a SWG, and I'd also like to replace the motor with a smaller, dual-speed model with a manual switch. I have a couple of compatible part numbers for a 1 hp and 1.5 hp pump from Inyopools, but they keep pushing variable speed models. Any advice? Can I use the smaller motor, or should I stick with the 1.5? Suggestions appreciated.