you've got plenty of height to add be using something else to raise your pot -- i assume for runoff? find a lower pofile bucket to catch it. You're not too far away from easily filling a 2.3x2.3 space.
looks like 4 plants in a lage pot. i'd make sure you heavily LST middle so that growth doesn't easily gain apical dominance later on and nowhere to bend it. it will make a level canopy easier to plan ahead in this respect.. If you control it a bit before it bushes out, you can force most of the growth toward the outer perimeter where there is more space to spread out. Once content, flip it... clean it up to reduce larf. let her do the rest.
better in individual pots that you can move around to make life easier, but if you do this again, i'd bend each out toward a coner... a bit beyond center before allowing to go vertical... shape will fit tent easily. more of a learning cuve, but if always doing the same thing, it's just a minor speed bump.