I trim my planes on the sim. And they go straight and level even at less than 75%.
Once you cut the power to start a descent while turning, this is when the nose drops tremendously.
This is normal on a sim, model or real plane, however, the difference between how my model's nose drop and how it happens in the sim is huge. All the models on the sim drop their noses really bad immediately after I cut the power. So, I have to hold a lot on the elevator while descending which cause balooning at the last minute.
Changing the parameters on each plane has caused the planes to act even worst. So, I stopped changing the parameters.

Thanks anyway