I did a simulation of two cartel strategies along the lines of my previous post.
Cartel power Cartel block fraction
......
50% 59.86%
Cartel power Cartel block fraction
......
50% 59.86%
There is something wrong with your simulation. Proof:
Imagine a bitcoin world with two Cartels, each with 50% of the power, each following the strategy you outline.
It is obvious that they cannot BOTH get 59% of the blocks.