My clutch pedal feels great when tooling around but if I get on it a bit and either accelerate from a stop aggressively or down shift to accelerate aggressively the pedal becomes very soft and mushy. After only a minute the pedal returns to normal, feeling nice and tight. I had the pedal assembly replaced 4 months ago and am experiencing no slippage when driving normally. Everything feels "normal" otherwise. Only after a hard acceleration does this happen. Thoughts?