In reply to pepperpot:
I dont much like the heel cups on these either, not nearly as comfy as my other Inov8s. Someone suggested I 'cook' to alter the shape, but I havent tried it as not too awful. Basically put the shoe in a bag, shaping bag into heel, plunge into super hot water and then mould to fit... Once you have done this, or if you decide to persevere you could try duct tape over your heel, smooth it on carefully and the slick surface will allow the shoe to slip a little rather than drag. That I know works !