I always heat the exact same spring on both sides and in the exact same order. One thing that happens is that when you are done and the springs are cooling off, they will settle a little bit more. This is why you really have to get into it so much so that it doesn't settle unevenly. Some people put blocks or a car jack raised up to the point where they want the car to stop dropping. I just use my eyes. After the amount of time I've been doing this, I have no problem using my eyes as my judge.
If you mean selling point as in trying to sell a car lowered that way, I guess it can be. But that really would be true in the case of someone not familiar or ignorant to lowering a car via that method.
No need to bounce at all. And with practice, no luck is necessary, either.
I've just NEVER (literally) had a problem. Later, QD.
QD shuld lower my whip for me.. i got cash son.
89 Sexima___VG30E
Cragar Steel D-Window Wheels____15x7, 0 offset