B-max4FT indoor astroturf setup help!

[CODMAN]

Hi guys, I need some input to help me setup my B-max4FT for a new track that is starting up. It's going to be indoors and 100% astroturf (so totally dry). Currently it's handling so well outdoors on slippery clay surfaces... But I need to adapt it to a smooth Astroturf surface with a few big jumps.

What I need advice with is which direction to adjust:
Sping stiffness (currently running stock on the bigbores): go stiffer?
Oil weights: Go heavier?
Ride height: Go lower?

and tire choice (I am totally lost here; Shumacher tires will be readily available)

I can also post a complete setup sheet if you feel it will help you give more precise comments; let me know if you want this.

Thanks in advance!