Hydra fix: the right way
Exponential decay of points.
An abstract example
It's like a decreasing multiplier. E.g. you get less points with every next 100 turns or every next 100K damage you deal (that could be done like a reversed Scarab shield so that you actually deal less damage).
The stronger the team, the bigger the penalty.
Newbie players would be barely affected. A Player A dealing 10 times more damage than Player B could then be competed by 2-3 Players B (and not 10, like in the current or former implementations).
Adjustable, predictable.
This approach would automatically equalize any champion or mechanic - existing or added in the future. It wouldn't break any existing team in Hydra, just make them less OP. It wouldn't affect anything in locations other than Hydra.