Having done a fair amount of CF shafts now, I can tell you that working with CF is different in many ways. You need to have the right tools, the right foams, the right glue etc.
I have found that using a collet chuck is preferable when doing joint work. I use phenolic at the joint end and I have use Tomahawk, Juma, G10, phenolic and canvas phenolic as ferrule material. First order of business is inspecting the CF tubes them selves. If they aren't straight and round, toss them out. Even with the heaviest foam you will struggle to get over 100g without some sort of weight added to get closer to 115g/4oz. Cutting CF is not good for your lungs or electrical equipment, so use a shop vac or dust extraction when trimming the tubes to length. Don't use regular HSS or carbide cutting tools, use a slitting saw.