I had my exhaust cam advanced slightly to create some overlap between intake/exhaust valves but this was on clockwise motion cams.
I could never get the low speed driveability smooth, it bucked quite a bit and i spent a lot of time trying to tweak the map.
We never came to a resolution but i put it down to the overlap created, which gained power but sacrificed some driveability.
Maybe it was map settings, i'll never know now.