In my limited experience, I've been told that once you cut shorter below 30 inches, things stiffen up quick. If you are kinda in the center of the perfect spine you could get that kind of range since carbons respond quicker than wood or aluminum. I noticed little difference between 200 & 250, 175 was still slightly stiff. I noticed the real difference when I got the broadhead on. U may find the same.
On the other hand, if I snap shoot and don't find/hold anchor prior to release, I can bare shaft well with any weight and it is decieving. Do it right and results show. So could depend on how you shoot too. I don't pay attention to where my nock ends up, just point of impact. Good luck.