I would say yes. Itís not easy to hook with a drag radial. Like mentioned already, once they spin you might as well abort the run. Iíve been 1.54 60ft on a manual 675hp rwd stock suspension car with a small 275/40-17 MT drag radial. Not a mustang, but the technique is basically use a slight clutch slip. The problem is the clutch needs to be able to take the slip which creates heat and last which is almost impossible to have both. Thatís where the clutch tammer comes into play or a pressure plate designed to slip and apply centrifugally.
If you want to be quick hitting a radial with a clutch, a pressure plate with centrifugal assist isn't the way to go. There are 2 basic issues-
...1- launch rpm is limited, as the higher you launch the harder that centrifugal component hits the tires.
...2- that centrifugal component bites you again by hitting too hard when it comes time for the 1/2 shift.
With the 'Tamer controlling a non-centrifugal PP, you can launch off the limiter if you want to as long as you have enough clutch. If you are shifting using the clutch pedal, the 'Tamer will soften the hit after the shift to keep the radials stuck. If you are shifting clutchless, the aggressiveness of the hit after the 1/2 shift is usually controlled by proper clutch base pressure, combined with a longer than normal 'Tamer delay.
Launch rpm is important to ET because it's basically stored energy, and the engine has to make the energy that it takes to spin up your rotating assy. It's better to spin it up prior to the start, which makes more power available to accelerate the car when the clocks are running. If you try that with a conventional centrifugal assist slipper clutch, that centrifugal assist ends up hitting too hard and that extra energy you packed into the launch just gets wasted when it blows the radials off.
A proper 'Tamer launch is softer than an automatic, but that softer launch lasts longer. It basically takes a clutch dump launch that's short duration but too aggressive, and consistently transforms that into a softer launch with more duration. In the end, you get a consistent dead hook launch without a bog, as well as softer shifts.