I tend to agree with you.

Usually if a plane has a neutral elevator and the trim is good for both power on and off flight... then it will fly fairly well. A neutral elevator usually means relationship of wing and stab incidence is fine. In this case, it seems someone added 4° down thrust in the engine to obtain the neutral elevator rather than adjust an incidence. Down thrust is more often a drag couple counter measure for a high wing plane or asymmetrical wing or both. This might mean then that without the 4° down thrust, that the elevator would require some down trim for power on flight and the OP's inquiry was about the incidence of the wing showed slight positive. That makes sense.

If he is then wanting to take out the down thrust and perhaps realign the spinner with the cowl better, the option would be to do so and then adjust the wing incidence to obtain neutral elevator... doing so by shimming the front of the wing down very slightly.

A word of caution... I have a P-51 with front wing bolts... and if they are not tensioned the same for each outing, the slight incidence change causes significant trim change... so make any front of wing adjustment in very small amounts. I'd use some 1/64" plywood strips forward on the saddle making adjustments by only one strip at a time. I've shimmed several wings to finalize trim and rarely used more than 1/32"