I wanted to ask you about this because I see things a bit differently. You seem to call "lack of slippage" as high volume, but to me, MNQ, even with the higher volume, has lots of slippage because its supposed to track the NQ, but often during times of spikes, can easily deviate by several points, and hence 10 or 20 ticks.I hope my algo doesnt break when I switch over to NQ. A lot of it depends on high volume (low slippage)
Now I'm not sure if your algo needs this, but this is what I see. If NQ for example pokes a key level by only 1 point on a spike up, the MNQ could poke several points. So if you had a stop there lets say, the fill could be much worse, depending on which direction you are playing of course.
But ya, even with the higher volume for MNQ that you showed, I think slippage is much worse.