The problem with high horsepower engines and solid motor mounts is that the stress created by a drag launch is transferred just through the motor mounts. This is why it can cause damage. You notice how all big power drag cars have a aluminum front block plate that the engine bolts to and then the aluminum plate is attached to the car. The purpose of this type of engine mount is to spread the twisting torque of the engine over a much wider area. The pulling force on the left side of the block and the compression force on the right side of the block will distort cylinder walls, causing a loss of ring seal and power.
You guys also mentioned that you have additional bracing besides the engine mounts. This is just another way of spreading the stress created by a launch. Yes it does help spread the twisting torque over a wider area. A torque strap from the front of the block will also provide better distribution of the stress.
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