| I would say that mine looked like that after one TD...and I'm usually in the novice/inters!
I'm not blowing my own trumpet...what I mean is that I think the rounding off of the groves is normal, along with the colouring. It tends to come up after a day or two.
I remember looking at the colour of the instructors tyres at a CSS and they were all running 207rr's...and they all looked the same.
I don't think its too much to worry about...but as has been said, its all about confidence, and if you are in any doubt...change 'em. | 
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