Well, if you can't replicate the whatever your feeling, I doubt the folks at the dealership will notice it.
Instead of "throwing" the car into third gear try "pushing" it into gear. Not trying to be cute, what I mean is to firmly and slowly push the shifter into third gear. It's not a toggle switch .....
It could be that the transmission is still breaking in and it will outgrow that stuffness thing.
humfrz