From looking at the ing spec. there doesnt appear to be much difference other than the NOR 70 seems a touch more soluble so would probably require slightly less CSCP 90 in the mix, so i dont think it would make a great deal of difference to the attractivness of the mix
Bank tackle do some xl ones that are pretty good, they are a bit longer and cover more of the swivel, I preferred those to normal length and they stayed in place better