That is weird. My 1155s are significantly better than OEM from cold. By the time I've got anywhere they're fine. I can't ever see an issue with them unless I start pulling off my drive and red lining it up the street following by an emergency stop at the first junction.
Do you have braided lines?
Yes,
I pull off the drive and brake from say 20 mph 100yards down the road,well I try 
I need about twice the stopping distance and when you forget its cold and wet its "oh sh** " 
Brakes are superb after that.
The disks are ready for a change but would not think that would matter,any way others have the same problem.
See jonnyboy above
Yeah that is really weird.
I went from standard, low, OEM lines and pads and discs to new 1155s, standard discs, fluid and braided lines. I took ages to decide between the 44s and 55s because I was terrified of exactly the issue you describe.
First time I put my foot on them they nearly ripped my face off from cold, but I suspect that had more to do with not being used to braided lines.
There must be something going on for two people to have such different experiences. Either that, or I have this to look forward to when mine wear down.
The only issue I have now is a big of squeal. I haven't had them long though so I'll give them a bit longer to bed in then trying stamping hard on them.