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Best Practice for fixing Negative Pressure at Pump

System: 

WaterGems Connect Edition Update 3

Not sure how to check which version but I checked and all my applications are the most up to date. 

Alright so I set up an existing system for a city that I help with. I have everything as accurate as possible. I have this problem on other projects as well. I have a negative pressure because of the suction on  between the reservoir. The pipes are the right size and roughness. I even tried using check valves to correct the issue. 

I uploaded the model through a secure file upload if you want to take a look at it. 

I tried increasing the elevation of the reservoir but then I have to change the pump curve to match. 

Is there another way?