Torquing down the various control arms under load is the key. I've used my jack to push the hub up to ride height. I've had my M3 control arms for 4 years now. No issues.
You need to find the ride height. It will be different with a lowered car: especially if you are going from a stock suspension to say the B12 kit for example.
You measure from the bottom of the front quarter panel to the center of the hub while the car's wheels are still on, before you put it in jack stands.
Then use that measurement when jacking up the hub.
A 3 ton hydraulic jack will provide plenty of pressure on the hub when moving it to ride height for a proper torquing of the control arms to occur.
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