There are a few reasons for this.

1. The wing is thicker and holds a servo better more inboard.

2. The airleron is at it's widest there, the higher point of aerodynamic resistance.

3. Rolling inertia is reduced by having the sero weight as far inboard as possible.

There are no problems that we have noted with the location. We did seal the gaps and our linkage with MK hardware (our preference) is absolutely solid. We have had no negative reports from anyone having any problems.

Thanks,
Mark