Not sure what boat you are doing this to. If a sloop, you do not want the draft forward where the jib overlaps.
With boat with semi wing masts (large major axis, low minor axis) the mast becomes part of the sail. So, you can move the draft forward enough so the overall draft is still in the low to mid 30% range.
On a fixed stick or roundish type mast like the Wave, you do not want to move the draft forward.
Rick