Tetra mesh from trias with maximum size control

Hello,

I would like to tetra mesh my component from a 2D mesh of trias that already exists. The 2D mesh must remain constant as it has a load applied to it that cannot be changed.

The problem I am having is that the tetra mesh option 'fixed trias to tetra mesh' produces large size elements in the middle of the model.

I would like to constrain the maximum size of the 3D tetra mesh so its does not increase in size in this way.

Is this possible?

Thank you in advance