737
I am not too sure how accurate flight sim is, but speaking of the real world I could give you some advice.
The NG series is much more aerodynamic than the classics. They are harder to slow down than the classics. This bounce could be caused by a too fast approach speed. You should be aiming at anywhere between 120-140 kts IAS depending on weight.
Make sure you have spoilers on touch-down. Flaps 40 gives the plane more lift which tends to give it a higher nose up attitude during the flare, resulting in this bounce that you are talking about. If you aren't using a short runway, try flaps 30.
Good luck champ.
If you were in OZ, id take you on a real sim.