Huh, I don't see any pesky platys, lol. A very attractive tank! You must be an energetic weeder of vals, they look good & under better control than my "jungle vals".
A friend had given me a huge sword when I set up my 75g several years ago, it was spectacular! But even with root tabs in the pool sand it gradually got smaller & smaller. I sometimes think it has died out but then I find a few small leaves. I know it's from several things: too many plants blocking light or in root competition, my bad ferts use & my love of busy bottom feeders, sigh.
Now don't take this as a criticism, but if you're not getting apistos...you might want to remove the "pot cave" & plant a pretty colored crypt in its place. "Mi Oya" is maroon & lovely but bronze or brown wendtii would also make a nice contrast to all your green plants. Just a thought...