Generally the air/fuel mixture is quite rich under acceleration when the engine is cold. That would explain the fuel smell if you're pushing to 6-7k while cold. Also until the engine and exhaust is up to normal temp, it's normal to have white steam out the exhaust. Just caused by condensation.

But the real issue here is that it sounds like you're being way too hard on the engine while it's cold. Seriously, 6-7k is way too high on a cold engine and gearbox. You should really try to keep it below 3.5-4k until it's at full running temp.