This is an Erpm graph from a different car/class, showing a ClutchTamer pass on radials just stabbing the clutch to shift (not bouncing the pedal off the stop), also using a single disc/diaphragm setup...



Notice that engine rpm is dragged down after the shift at a much slower rate than the clutchless shift graph posted earlier. When rpm gets dragged straight down quickly, that indicates a near instant release of inertia energy which almost always knocks the tires loose. ClutchTamer spreads that energy release out over a longer time frame to reduce it's intensity, which helps keep radials hooked. If the clutch pedal had been bounced off the stop on the shifts, pulldown rate after the shift would have been softer and more like the launch.

Grant