Power draw in 150 vs 250

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DLHDesign

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I'm running a 150 and 250 in the same tank; one on each side. I've got them connected up to an Apex - each with their own outlet. They are set up to run an alternating current pattern to 75% max:
upload_2018-4-22_0-13-41.png


Yet when I look at the power draw from the two pumps, I see a significant difference:
upload_2018-4-22_0-15-13.png

(The 150 is "RT" - the lighter color - while the 250 is "LFT" - the darker color.)

Both pumps were recently cleaned and reassembled using the same configuration of blades. Neither are obstructed in any way, so I doubt it's anything to do with their position in the tank.

It's obvious to me when I watch the tank that the 150 is clearly underperforming compared to the 250 as well.
I was under the impression that the 150 and 250 motors were the same; is that actually the case? As I move up to a bigger tank in the near future, I'm going to need both pumps operating at the same power levels. Will I need to replace the 150 with another 250 to get this, or is it possible that my 150 is faulty somehow?

The 150 is about a year-and-a-half old, running around 50-75% pulse most of that time. The 250 is months old. I can understand some degradation over that time, but more than a 50% loss in power draw seems excessive...?
 

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