Helical wraps the fletch around the shaft so it spins faster.
Straight is just straight down the shaft. I use AAE fast set gel for everything.

I too agree with BG about everything except the shaft cleaner part.

DO NOT use chemicals like acetone, alcohol, etc...to clean the shaft if you are going to use "super glues". Most people don't know this but these chemicals reduce the bonding strength of the fast set"super"glues.

Use a clean rag and only water to clean the shaft if you are going to use fast setting glues.

If you are going to use solvent based glues like Fletch-Tite then you do need to clean the shaft with acetone.

Do not rough up the shaft. It creates carbon dust and this dust gets imbeded into the "pores" oc the carbon fibers and reduces the bonding strength. A carbon shaft is plenty rough enough.