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Controllable and head-pressure don't often collide in the same sentence. Sorry.
I would look for pure reliability and get a Laguna Max Flo or a Fluval SP series - just find on that has the flow that you are looking for. They are not power hungry and people have been running Askol based pumps for decades without issue. I can get about 1500 GPH at 15 feet of head from a Laguan, but I forget the model - maybe a 2900?
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