Can't speak to a given laptop program without do some testing on it .. but, in general, all the laptop should be doing is giving you the certification data you could get from the AFM or certification programs.
Keep in mind that we look at half the headwind and 1.5 the tailwind.
Rounding the OAT a degree is not going to make a large difference to the real world experience. Keep in mind that the certification workup normally takes test weight to 1-2 percent.
Other than for a bad day and close-in obstacles, the aircraft, in an OEI situation, should have a progressively increasing clearance above the bumpy bits as the takeoff climb proceeds.