The reason I do three rounds, with each miner running on an instance one time, is that the rig has a mix of 1080Ti cards, and as much as I've done to balance the instances so that they hash the same, they're not identical and some differences are to be expected.
but you need to run each round for 12 hours, if not the comparison is not fair. You run 2 rounds 9 hours and 1 round 12 hours. 12 hours is not enough to make a good prediction.
Instead of X16r, you shoudl compare the x16s algo.
sp-mod was credited with two very small blocks that the other miners were not
Because they where busy mining the devfee. (switching pools, missing profits)