Well Robert, well done on the redesign, establishing and measuring a safe balance point. I still think you are doing things backwards now though.

Did the model show signs of being badly tail heavy when you flew it (I'm not talking about the elevator position here)? If it flies ok why not try the cg tests Speed, Jennifer and I are recommending. That will tell you if the balance point is right or not. If it passes the cg test but is too twitchy reduce the elevator throw or add expo.

If you arbitrarily move the balance point forward it should still be safe enough to fly (as long as you don't go to far) but why would you if it involves modifying and extra weight that may turn out to be unneccesary.

I understand the full size S1-T may still be on the nose heavy side, but you can be sure it flies inside its safe cg envelope. That's a legal requirement. It seems odd to try to replicate what most would see as a fault for scale reasons but each to their own.

By the way that elevator aligned with the stab trim setting hardly ever occurs on full size aircraft. It can only be right for one particular balance, weight, and speed. As soon as you change speed or burn off some fuel the required trim will change. Even the S1-T will have the elevator deflected down if you fly fast enough

Here's some good tests for cg;

1. Trim for hands off straight and level at a medium to high cruise speed, push forward into a 45° down line and release the controls.

If it pitches nose up quickly that's nose heavy.

If it pitches up slowly that slightly nose heavy.

If it maintains 45° that's neutral.

If it pitches nose down it's tail heavy.

2. Trim as above and then roll inverted hands off.

If the nose drops (models nose up) strongly, nose heavy.

Weakly, slightly nose heavy.

Stays level, neutral.

Nose rises (down relative to the model), tail heavy.

3. Trim as above, pull 45° up then roll inverted.

same symptoms as 2. above.

Most pilots prefer slightly nose heavy.

Another down side of too nose heavy is that the elevator trim changes strongly with throttle changes. IOW when you close the throttle the model goes into a steep dive, and when you open it the model climbs strongly. Down thrust helps with this problem as does an elevator-throttle mix but you can't get it dead right. This in addition to the other things I mentioned in my first post.

At the end of the day you do what you are happy with though, I'm sure you will be fine either way.

Best of luck,

Dave H