Advancing Cam Question

On “Most” of the 3 key way timing sets I’ve used, the +/- 4 is advancing the “cam” +/-4 *………which ends up being +/-8* at the crank(on the degree wheel).
That’s almost always more than I want/need to move the cam, so I basically don’t buy those anymore.
I use the 9 way sets where each notch is a 2* move.
On a SBM, you can use the offset keys in the cam for finer than 4/8* adjustments.