Say, ever tried some 0.23 BB's in that scorpion? As being the inbetween of 0.20 and 0.25, allaround BB, you might even get best of both worlds with small gun like that. Added stability from heavier weight and higher fps from little lighter ammo than 0.25. Potential monster in your hands if they work as i think they'd do.
Could certainly be worth a try dont ya think?
[Edit:]
Another point of interest here would be regarding the JG vz61, if in marui the fps is improved that much without touching the spring, how would it be in JG. Is the Jing Gong scorpions reported better stock outpu