On your vibration, try silicone 2" ID fro McMaster Carr ........ It made my vibration disappear completely.I was saying take 1.5" pipe right to the tank then switch to dual 1" returns there. Dual 1" from the sump probably wouldn't help a whole lot lol. I need to give up my MRC6100, the pump is amazing but rediculously overpowered for even my basement sump setup. I've had to dial it back so much. I think the back pressure is causing a TON of vibration. And you can feel/hear it in my floors. I wish I could toss my sump in the garage (And so does my wife) but our cold months do not help there lol
I just ordered a 12" long piece for each of my pumps, and installed them with band clamps around 1 1/2" pvc about 12" off of pump outlet . Best $50.00 I ever spent.
https://www.mcmaster.com/hose/high-...ft-rubber-tubing-for-food-beverage-and-dairy/
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