MrP, your car likely couldn't leave from low rpm because it didn't have enough grunt. Big tire, low torque. By giving the motor a "run" at the converter, when it hit, the motor welded itself to the converter, tugged it a little, stuck the tire and then knocked it off. Anytime you leave "on the converter" it doesn't shock the chassis as hard, because the flash is essentially gone.

In Greg's case, he can start higher and keep lowering it. His car would leave harder and 60ft better from about a 3200 rpm hit if it will stand the tire up......, but not sure he can get it on the tire that way.

Low wheelie bars more or less "prop" the car up on the bars and not let it crush the tires. Bars are both a crutch and a tuning aid depending on setup. Having them high serves zero purpose other than a safety catch