The KD rig, (capitalised as its re-inventor was Kenny Dorsett) was originally used with a shot on the hair and a pop-up on the hair to keep it low to the lakebed, critically balanced.
It works best with a short shank curved hook, Gardner Mugga style.
Personally, and it is not a Korda dig, I found that Korda Kurvs simply were not sharp enough and did not hold their point for that long in water.
Look at your hook holds, where is the hook ending up in the carps mouth?
Middle of bottom lip perfect hair length, deep in mouth too long, edge of lips or losing fish, hair too short.
I'm going to merge the two KD rig threads as this post answers both