Changing contempt

Adjust contempt according to our best value, allowing better utilisation of contempt factor.

Passed both STC 
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 9564 W: 1829 L: 1699 D: 6036

and LTC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 66608 W: 10524 L: 10121 D: 45963

Bench: 6783255