[cleszkie]

If your pusher fan is trying to move more air than your mechanical puller fan is pulling over the area that your pusher fan covers, then the pusher fan is not operating at its full efficiency. It is basically dead-heading against the slower puller fan flow. I would try moving your pusher fan to the other side of your condenser. That is where I have mine mounted. That way, the pusher fan can operate at full efficiency, regardless of the puller fan flow rate. The excess flow from the pusher fan going through the condensor will just bypass the radiator by escaping through the gap between the condenser and radiator.