Centro rear hubs..0.5 vs 0 degree

[Pops]

As we used and modded the b4.1 alloy 0.5deg rear hubs we now have rear toe in of 3.5 degrees?(think thats right!) But looking at all the finished pics, most are using the 0 degree std hubs. Ran the car at caldicot last friday and(according to my son) it was awesome.
So what effect can we expect by changing to 0 deg or should we stick with 0.5?/
Dave