I still attended the meetings for about a year after learning TTATT. My comments during meetings stopped for the most part, however I did go out of my way to comment on any paragraph that talked about JESUS instead of JEHOVAH. No one ever said anything to me but I am sure I sounded like a Jesus freak when those were the only times I would make a comment and the talk about Jesus was so rare.
If you feel that you must comment, find one paragraph where you feel that you could make a comment that might get others thinking a little, but without sounding full on apostate. I could blast the pharasees in a way that should have made some think, hey the JW leaders are not much different from the pharasees in Jesus day.
I agree with others to just stop, but if you feel that you must, it is possible to find paragraphs to comment on non-doctrinal issues.