Here’s a suggestion. What about a simple adjustment to how the points are deducted after a loss? Keep the same points for a win but scale the deduction by the margin of defeat: so someone who has a proper crack at it and loses by a narrower margin is penalised less than someone who just takes the 10 points and sulks. That might begin to take the sting out of losing in a clearly asymmetric match up (& also encourage participation).