Greedy. I have used the wedges and the t/shaft spacer as well as lifting the gearbox 6mm and no vibration. BTW check the length of the rear brake hoses on max extension. I would suggest you have longer ones made as there is too much stress on the standard hoses when the suspension is at max. I have done mine from braided stainless hose. They were just to tight and we all know what happens if one of these split....OOOPS. Food for thought..
BTW the spacer is steel and I think the price is fair considering the amount of work that goes into one. As a one off job at a machineshop I think the price would be considerably higher than we paid.