You are correct sir. Unless the car has a lot of gear, data will always show more slippage at the 1/8 because the converter will see more load at that point on the track. The more distance and time down the track gives the converter time to catch up to the crank. Race pac data will show that the most amount of slippage occurs on the shift when it is under a load, in some combos we have seen as much as 50%-60% at that point (IE.-PG, weight, gear-ect)so you can see how ratios, torque and weight affect coupling. It's all about the specific combination you run and optimizing that combo to get it down the track as efficient as possible.