How to avoid negative jacobians while morphing

Hello guys,

I want to morph a model but after moving my handles there are always some negative jacobians/folded elements. Also after a small movement (about 1-2mm) there are some folded elements (sometimes only 2 folded elements). The size of my model is around 150mm * 250mm and the element size in the moprhing region is around 0.5mm - 5mm.

Is there any options to avoid folded elements? Maybe meshing with smaller elements or bigger elements or try some various options in the 'morph' subpanel?

It would be great if anybody can help me!