I've been told that MG soil is usually too hot for seedlings. Maybe one of the experts will stop by here tell us about it

I strongly recommend LST if you have height limitations. My 3 plants have done well with it. It may be hard to keep your plants under 2 foot tall though unless you do SCROG. Or tie them to something outside of the pot to make them spread out. The canopy on my plants takes up about 8 sq ft and they are all over 2 ft tall already. And they've just started flowering so there's more growing to be done

Another way to keep em small is to switch the lights to 12/12 a little early. Just remember that some strains will triple in height after they start flowering.