Update time.
Just got back from SFS as the noticed the problem straight away. There should be a small washer between the plys of the hose so that the valve has a flat, solid area to clamp to. Without this the silicone will keep 'splaying' and never seal properly. Also the nipple should be glued in during production. They were going to try it on mine but without the washer it would be a pointless exercise.
They've stopped using this type of nipple and showed me a set of the same hoses they used to make with the nipples and how they should have the washer.
I've ordered one of their sets now, they do an RTOC discount, if anyone knew? And special cash prices
I'll be getting on to ASI now and try and send these things back.
Essay over!