The double nut idea is fine for drag racing and getting you car to hook up AKA weight transfer. Just so you understand, The torque applied to ALL RUBBER SUSPENSION PARTS is VERY important.
The rubber items in your front and rear suspension ARE PART of your suspension. With all rubber items loose and double nutted Your car will drive like it has NO shocks and or all the suspension is worn out.
Many design tricks can be used on a RACE CAR, They also work very well.
Some of the (many different type of racing ideas) do not work well on a STREET DRIVEN machine.
Use caution when " Playing around with the suspension on a street driven machine ".
Bob