I love daily prax in my backyard with variety of foamies.
Playing in the breeze with light w/loader.
Prax with foamies makes it perfect for more serious ones.
At least 1.5 to 1 power to weight, lot of travel and definitely no +expo for 3/D, with expo you are defeating the purpose! You need instant correction response for all controls, not mushiness. For 3/D performance I personally prefer larger Dia. with lesser pitch props.
Naturally, lot of prax, ideal to have few smaller foamies to keep it up.