Speed scaled proportionally. Power did not. When you increased Speed by 50%, motor power went up by exactly 50%. When you increased Power by 50%, charge speed went up by
125% — not 50%. That's because charge speed = P², a quadratic formula. The same input scaling produces a much larger output jump.
Speed → Motor Power
Same growth rate = Proportional
Power → Charge Speed
Much bigger growth = NOT Proportional
Why this matters for your proposal: if you argue for raising a stat cap, you need to know which formula it feeds into. Raising a Speed cap is proportional — predictable. Raising a Power cap is not — the effect grows faster than the stat.