if you are launching at around 4-4.5 k without any wheel spin there is alot of stress being placed on the driveline components as everything goes from being stationary to trying to turn at roughly the same speed you are doing in 1st gear at 4k whatever that is whilst trying to shift the weight of the car, with a bit of wheel spin that load is greatly reduced as the driveline is able to spin up freely whilst still moving the carand as the tyres start to gain grip the car is already moving
what i was referring to above was i thought the vid you posted was what you were basing your argument for getting launch control as the car launched quite easy on the dirty road
mechanical sympathy is all i am getting at
good luck with the launch control