The Cam grinder should have ground the cam with the stock settings. IE bolt the cam and time it like you would from stock. The 4 degree that the grinder has built in ...should be built in and the wheel and checking that you are doing in most cases turns out to be nothing more than checking.
Half a degree here or there is not going to be noticed by anyone driving their car. If the cam is way off I would not trust anything about the cam and would buy another one.
John