Read the responses to your earlier thread carefully. Regardless of weights, if you are inexperienced with acro do *not* try to teach yourself in any 'clean' a/c like an RV, T-18, Mustang II, etc. And if you get instruction in one, make sure the instructor has experience in that type plane.
The 1st time I rolled my new-to-me T-18, I split-S-d out of it. If I hadn't had an instructor with me, I probably wouldn't be here now. And many years ago, a friend tried to teach himself acro in a M-II (well under acro gross) and killed himself by pulling the tail off.
All three of the types fly great, but they aren't intended to be trainers. They're so clean that they can overspeed very easily, which can lead to flutter, or to excessive Gs when trying to pull out of a down-line. The acro trainers tend to be somewhat G limited just like the RVs (ex: you shouldn't do 2-up acro in a Decathalon with full fuel), but they're harder to get to VNE due to drag.
Charlie