I just did a change in my DL from 28 1/2" to 26" and nothing change except the nock move down a hair bit but nothing major. After the change I did a walkback and paper tune and it is still the same as before. My speed went down a bit (10-15FPS) but after crankingmy DW up a couple turns it was right back to same speed.
Now I shoot more accurate, relaxand no more creeps.