I used to like my arrows about an inch longer then my draw with wood and aluminum.They have enough available spines where you can work that out.But with carbons they don't have as many different spines as other arrow materials.With carbons you basically adjust the dynamic spine by length and point weight after picking out a starting static spine.I let my tuning determine their final length.I bought some used carbons that were an inch past my draw and were showing alittle stiff.So I thought I could just add more front end weight to weaken the spine.They got worse the more weight I added,they were in effect bouncing off the riser instead of flexing around it.I did tune the same spine carbon to that bow but they ended up about two inches longer then the used ones I had bought.This was on a longbow cut about a 1/8" off center.They probably would have tuned on a recurve with a riser cut past center.I find carbons more sensitive to length on bows cut off center then recurves cut past center.I would rather have my arrows tuned well then worry about their length with carbons.I've seen plenty of used carbons for sale that were just cut to length and they couldn't get them to fly well no matter what they did.It turned a lot of new carbon arrow shooters off carbon arrows,they are a whole different animal when tuning to stickbows in my opinion.