Thanks to all for your help and advice.
I don’t think it is a sole issue. I can use the shoes fine with Crank Bros.
The cleats are not too close to the studs at the front and I don’t find that the plastic tread either side of the cleat causes any problem.
I have tried the cleats on the right feet and opposite feet. I prefer to wear them on the opposite feet to get the extra bit of float. I find that whichever foot they are on, they are equally as hard to clip in.
I believe the problem lies with the pedals , that they are too stiff to clip in to easily.
They have adjustment dials on the side of each pedal – which way do these need to be turned to have least tension ( the plus or minus)?
Does anybody have any tips on how to loosen the (springs?) pedals up?