My neighbor may chime in if he sees this, but he ran 3/16 line at roughly the same grade you have. His lines were a lot shorter but he recirculated and had less lengths. I think - key word think - you might be asking a lot of that little pump. I do not think they are made to try and accommodate that much suction power. Hopefully someone who knows more will chime in
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Mead Maple "It's for the kids..."
Paul Cerminara
2019 - First season ever
-Goal: 3 gallons
-Season Total: 7.5 gallons - pulled taps after running out of firewood and time
2020
Built 2'x8' Oil Fired with Thor drop flue pans
-Goal: 20 gallons
-Season Total: 55 gallons