In my opinion most recent fights should have a bigger impact on points for the ranking system. You could have a fighter dominate lesser fighters and get a great run, but when comes up against more evenly matched fighters he struggles. A fighter like this would have so many points already accustomed it would take ages to drop back down.
For example in 155lbs, my fighter Amana has already beaten Viki (2 fights ago, by knockout in the 2nd round), but yet Viki is still the number 1 contender for the belt based on his previous record. My next match, is another fight with him, and if I win that again only then do we tie on points so still not actually overtaken him.
Amana - 319704
"Im going to knock Viki out for a 2nd time, then Im turning my attention to Bulver. I want that belt"