At 25k a 109g-14 won't autoclimb on a steady course. Aileron trim is fully deflected and you tend to drift into the torque. It requires constant course adjustments.
Same for typh on auto climb -- by the way this has always been this way, since AH1 -- and a couple of other high-torque aircraft.
When it does this, just note the default auto-climb speed, and set it to 10 or 20mph more with the ".speed xxx" command. In typh, if it's default at 175, type ".speed 190", level out til you hit 190 then engage auto climb again. It only happens because you're slowing down past the point where airflow keeps the plane on course.
Something like that.