Donkey,
I used to have the same problem as you,nose bounce. I isolated the problem and it was the rudder axis.The light forces required on the X52 seem to greatly exagerate this effect. I would pull the trigger and I could see rudder input which caused the nose to swing left and right.
This can be solved with use of rudder pedals,simply remove the twist rudder and 95% of the problem is solved. I was also having some elevator input,the actual nose bounce,this was resolved by enable scaling. I simply reduced the input,at the center of the axis for Elevator,the first 3 or 4 sliders on the left were set quite low.
So, be patient,try some adjustments,think about pedals and Practice,practice,practice.....