I think that you would be best off setting up a decent 3 point lighting set up bfeore going into adjusting the SSS.

At the moment the SSS on the lower level looks like the weight is set too high and as its lit just form the back its making it look too blown out, if you set up a nice lighting rig so that you can see your model lit then you'll be aboe to tune i a lot more easily and get a better judgement of the overall look.