I would just let Hotgolf do it, loads of us are rocking his stuff, he did my gearbox too, top guy
when he did mine, he asked the power of the car etc before he did any work. He then told me the correct weight to go for, too light on mine would be no good apparently (Turbo 350+ bhp)
He did say, on a non turbo car he would take it as light as he could whatever that means..