Is There a Gardener in the House?

A plant that large in such a small pot isn't good. Those are surely root bound. Most everything needs as much growth under the ground as above the ground. Get them in the ground and prune them back to about nothing and they will thrive. If you ever get to Falls Park in downtown Greenville SC, Go to the far end of the foot bridge and have a look at the bank on far side of the road cut through there. The exposed roots of a giant Oak tree is a great example of equal growth above and below the surface.