Elevator
There are many things that go into a Planes setup....One of which is CG....another is control surface size....And perhaps you need a little more throttle to help hold the nose high attitude. Most 1/4 Scale Arfs I have seen or flown are not really setup to 3D Some are like the H9 Edge and the H9 Cap does pretty well. But like the Sig Extra and Cap are really setup to fly IMAC or sport fly they are tough to learn 3D stuff on. The main reason is they have smaller surfaces that need extremely large throws....Not to say it can't be done...its just harder to do it without the right tool.
More Tail Heavy may not be the answer if your looking for a better Elevator or Harrier. It may be more throttle to help hold the nose up....In most cases you don't just come to idle and give full up elevator you need a few clicks of power.
Try many things but in all actuallity many people stick the CG way to far aft and then have tremendously huge rates to fly on all the time. Stick them on dual Rates and use lots of Expo on the 3d Rates.
A more balanced plane will fly better and will even 3D better. Once you learn how to do it it will make a difference. The super Tail heavy setups don't lend themselves to flying well and they become unpredictable which means its tougher on a beginner to 3D...Reason being you might be fighting a CG issue rather than solving one.
Troy Newman
Team JR