Yes, in general, you have one of the benefits of the long motor stick correct. If a longer stick allows a longer tail moment arm (essentially, the distance from the wing TE to the Stab LE), this moves the center of pressure more towards the stabilizer which allows, generally, the CG to be moved more towards the stabilizer which allows a shallower decalage angle (difference between the wing and stab incidence angles). Lower decalage angle will generally reduce drag. Whether this is optimal or not you would have to build and test.
If you want to test longer motor sticks, I would build and try. A difference of at least one inch would probably be significant.
To test longer motors, I would keep thickness actually density in grams per inch) constant and try longer and shorter in two inch increments (loop length) initially. The, of course, try different densities too. Lots of testing is the route to success.
The stock FF kit design has a high static stability margin and can accommodate a CG that is further back towards the stab. So, extending the motor stick one or two inches is unlikely to cause stalling issues.
A long motor stick is more prone to bending due to motor tension though, and this is not a good thing. So, the stick needs to be light and very strong.
Motor length and stick length are not related. You’ll want to see the other threads that discuss this. Coach Chuck and I both have comments in these other threads that will be helpful for you to read.
Stick length may have only a small effect on duration, if any. Best to focus on propeller design, pitch and rubber density and length and winding procedures.
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