I'd say if you get 2 dried/manicured you did awesome for a tree that doesn't look like it was topped at all

POT and haze know they're stuff I'd say POT is right on with the finished yield and and haze's estimate of 3-4 is right given ideal conditions

In theory if grown and trimmed correctly having more plants only increases the yield a little bit but it allows you to cycle quicker cause no topping 4 plants will fill out similar to 1 tree that was topped 3 or 4 times and tied down etc

I'm fairly aggressive with manicuring cause I figure why bother smokin leaves and gettin more crap in my lungs than I need and I got 2z's stemless/leafless from 2 plants

I'd say you're probably fine to add bloom boost even a double dose if the miracle grow has some won't kill your girl

As for more nutes I'd water with very weak solutions at first and gradually move up depending on how she responds cause I've never used the time release soil feeders

If the soil noted it was designed for tomatoes I'd say you'll probably be fine cause I think they eat even more than mary j