Coolant leak

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I seem to be loosing lots of coolant. I think it only happens while the motor has a load on it. I can probably get 2 gallons a month in there to keep it at full. It looks like its coming from the drivers side EGR hose. Its always on the front drive shaft and frame rail. The radiator has been replaced, and the updated hoses with the 2 O-rings. Gonna try to do the EGR delete Next week and see if this helps. Also will change to this Evans coolant I see being talked up. Opened the cap yesterday while the motor was hot and no pressure but I could see boiling. Got under the truck with all necessary safety's in place while my buddy gave the truck some heavy throttle and no visible leaks then. Any thoughts? By the way, no visible coolant stains up top.