I know I can control when the timing comes completely in by putting a slightly heavier spring in. I wondering if by doing this I can slow the timing from just coming in all at once so the timing hits more of a curve... if that makes sense.
It doesn't come in "all at once" at all, it varies as the manifold depression goes up & down, the can arms are notched to control the maximum the can will add to the basic total You've set...the spring tension adjuster is the control of the "curve".