I've found you can "trim" the pitch using the throttle(s) rather than the control tabs trim. Get it close enough then if she starts descending add a touch of power - airspeed increases, lift increases and she'll come up. Or vice-versa. Sometimes it oscillates around a bit but if you leave things alone rather than constantly fiddle with the controls trying to chase it, she often settles down to neutral or close enough that you can safely mess around with the radios, maps etc.