200fps is extremely low, it should be around 400fps, and a 400fps spring certainly shouldn't cause cycle overlap on a 8.4v large battery
What is the ratio/brand of your gears and motor?
If you have higher ratio prometheus gears, a light spring and a weak magnet motor (IE TM, CA, ICS, G&P M120) the momentum carried over from the heavy gears will cause overlap of 8-10 rounds on a 9.6v large battery, less on an 8.4v large.
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