Nex Resin supports and model break

Having trouble with Nex Resin. Generally speaking, the supports seem to break and the model itself is brittle (see pic). Sometimes the prints don’t stick to the build plate at all.

I’m using the standard Asura slicer settings. I lowered my laser to 51 per recommendation. My workspace is rather cold so I got a heater going to bring the ambient temp to about 30c. That helped a little bit but this is best result so far:

Maybe turn the laser up a bit. Advice?