Just a thought, and this has been driven by our need to build thin membranes, our print chamber temp is controlled to 37 deg C (F3 chamber set at 35 deg C and of this morning my F2 is set to 35 degC via FL software) This was to reduce the resin viscosity so as not to create resin puddling around the supports that flowed onto our product.
Using appropriate PPE and checking flashpoint of dental resin, heat a small beaker of resin and dip your part and observe how it drips off. The lower the viscosity the thinner the film you will be left with due to surface tension. You may also need to keep your environment warm as well, so that the viscosity stays low will dripping.(low temp oven?)
You do not change the chemistry of the resin nor the biocompatibility ( actually, depends on conditions that FL have submitted as cured parts, ie FL may have set process conditions bands with respect to environment temp, laser cure energy and cure time and temp etc )
Also put in a sacrificial spike to draw off excess resin away from your part.
In short play with the surface tension by controlling temp. Have used these techniques with many polymer resins besides UV cure.
The inspiration came from nature by watching rain drops pool and drip off leaves and branches many years ago.
Let me know how you get on if you try it.
Biofilms are a bugger and you may still not get a smooth enough surface to disrupt their adhesion.