I got giant 9 1\2-10 ft tall 10 ft wide plants in 30g smart pots, ROOTBOUND!

I would just feed and water like you have been if you can swing it. If not, like they said with a timer. I did the hydrogen peroxide and water dunk for my outdoor plants last year, lot of crap comes off. The burnt plastic should not be a large percentage of the ash and it should not stick on any worse than the rest.
 
Your roots have definitely made it through the pot and into the ground by now. Rootbound isnt really a thing in fabric pots.

these are in the ground for sure. I bet they are not able to be rotated in place, I used to grow in bags on the ground even on heavy duty weed barrier x2 thick. they still went through.. ... I fixed the issue by putting the bags on stepping stone bricks so they air prune and stay 6 ft tall.

Plants look great.
 
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