| I went from a 60 to a 70 and it was a very good move. I was pushing the front a lot with the 60 and completely off the edge of it. The 70 still had a little bit of room to play with - well worth the change.
I don't know about geometry changes to be fair - we were playing with mine to get something that felt comfortable for ages and didn't really solve it until after Snetterton and I was already using the 70's before then.
If you're not running out of side grip (I don't know how much lean you carry) then I wouldn't be too rushed to change it if I was you. But, if you're nto carrying that lean at the moment you may well do in the future so it will be worthwhile changing it to get used to it. | 
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