Too Tight?

I re-potted these plants in March, but they're already beginning to outgrow their pots. I'm not sure whether to leave them as they are, or whether I should pot them on again. Any tips?

M. laui ssp. dasyacantha, M. candida and M. prolifera

I think you could, so log as you don't disturb the root ball too much. You've got about 2 months before you should stop watering, so they will have time to settle. But equally well, they won't come to harm if you don't, as they probably won't grow a huge amount more before then.
But I am still repotting and potting on seedlings, as I expect them to settle in before watering ends.

They would be OK till next dormant season. Think about shallow wide pots, maybe.