I have some center cut Shrews, but that was by special order and is not the standard. Also, on heavier bows or bows with materials that are not as strong it may not be recommended. I shoot AD Trad Lites and AD Hammerhead Trad Lites with Shrews similar to yours with good results, regardless of point weight. Other shafts are not as forgiving and may require you to experiment more.
Are you sure your bow is not a Shrew Classic Hunter? With a 56" length and your draw, I cannot imagine you have a Super Shrew that is the longer riser design as opposed to the Classic Hunter. I can certainly understand the fact that the bow shoots so well for you, because that is generally true with everyone who tries them. Congratulations on your new Shrew.
Allan