If you are slipping the clutch while doing this, then it IS prematurely wearing the clutch down.
The "engage" point of the clutch seems to be very finite, vice gradual with many other cars. It is either biting, or not. You can continue to press the clutch to the floor, just become more aware of the engagement point on the transistion upwards, and don't pass that point up too quickly. This is what is likely causing your "two jerks"...
Those would be the clutch engaging very quickly, and the car jumping forward because of this... after two bounces, the momentum is absorbed and you are then in control with the gas, again. The reason the later gears do not do this is because the ratios are steadily decreasing, and you are getting less torque per gear.. (less ability to make the car LUNGE...)
Take some time.. practice with it, and you'll get it.
Ray
