Nobby, most of us find that GF1s take a few hundred miles to bed in - some have even regretted their purchase at first but they are an excellent all round tyre once run in. Swiftly put me on to them some years ago and I've always used them. Been impressed and don't intend to change.
First thing I did when I got my zed was replace the rfts with eagle f1s, nothing compares in both wet and dry, and mileage for the money IMO, and wouldn't put anything else on my cars. Great tyres.