Scientocracy (to my understanding and as my intended meaning) is government by results, i.e., eschew policy debates to instead argue and then agree on metrics, run an experiment and then transition to whichever solution produces the best outcome as determined by the agreed upon metrics (of course, if cultural, climatic or other considerations make a new policy ineffective in a certain place, the policy should be revoked or adapted there).
My question is what is the 'ism' associated with this? Scientocracism isn't a word, and ends with racism, so that doesn't really work. Technocracy (a related, if more loaded term) has the same problem.
An example sentence would be: I believe in representative democracy, but I also believe in  because while I think that we should be able to elect people to represent our interests - and fire them when they fail - I also believe in results.