Sorry about the slow reply!
I don’t know any way to test multiple mod()-universes at the same time. The closest would be to use a python program through the API (but no simulations this way, unfortunately), or using the optimizer.
The optimizer works pretty well, make a simulation with the rule “mod(stockid,4)=0”, and then add the alternatives “mod(stockid,4)=1”, etc, in the optimizer. Run the optimizer, then update the contents of the ranking system to whatever alternative ranking you want to test, and run the optimizer again. Finally compare the results in Excel. This makes it easy to simulate many universes over several time windows without enormous amount of work.