What is a good aerobatic park flier trainer?

Aerobatic and trainer generally don't mix too well.

As a club instructor its been my experience that most students will have their hands full with a full fledged trainer until they master basic R/C. That alone is just a basic journeyman at the solo level.

Its also my experience that most students because they have not yet learned in the beginning stages of flying R/C to fly close, a park flier presents its own set of challenges. Generally a smaller airplane requiring calmer conditions to fly often makes training more difficult. Adding aerobatics to the mix adds a whole different set problems until the student's training skill set improves to the point where acro training can be comfortably added.

Just my experience and humble opinion.

Triple post computer problems, or operator error?

Triple post

Don't do it i did and now have a plane to rebuild stick with the trainer tell you can fly close to you .

An aerobatic trainer....Do you want a trainer to learn to fly from scratch or are you a compatent flier who wants to learn aerobatics...ummmm