Based on UselessBettor Test my system and using a few others opinions a good little system with some nice results were based on using Don Scott = 1 and barrier 5+ and some other filters.

Is this an example of mixing indepedent variables due to the fact that the Don Scott ratings are actually calculated based on points and certain points in the final rating are deducted for bad barriers and bonuses for good barriers.

Essentially you are changing the weights of the ratings?