I'm new to the dex410, but quickly found out it react to minor chances.
The first test i did was on a bumpy grass/dirt track with high grip.
The rear was very loose and kept jumping all the time, almost made the car turn up side down, it was undrivable. Didn't have much time to play with setups at that time.
This weekend i had another test at another track. At first it reacted the same as before. I decided to chace the rear shock oil from Ass 35 to 30, a minor change, but it made wonder! It was a totally new car. It was planted to the track.
It's just a small advice from me, don't get blinded by diff oils, weights, or springs. Sometimes the small solution is the best
