Help! new electric box installed, pump not as powerfull

If it's wired at 110 VAC, I can understand the increased amount of heat since its pulling more current. However, the fact that is is potentially pulling less water doesnt make a lot of sense if the only thing that has changed is the VAC it's running on. It should still spin at the same rpm. Unless the resistence is so high and the wattage is lowered enough that it doesnt spin as fast. That shouldnt be, but stranger things have happened.
 
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