I'm a bit amazed that anyone would want to fit a 130/70 - in theory this drops the back end by 17mm compared with a 120/90. I would just bite the bullet and buy the Harley. The 130/80 only drops it by 4mm, not so bad, run with a 110/80 front even a bit less bad. It is a personal thing, but I try to get quicker steering rather than slower. I can't get past the 110/80 and 120/90 combination on my Jota, have tried several alternatives but I feel this is the best. Having the front a little lower really helps the front tyre feel more planted in fast bends. But if you have tried it and don't like it, each to his own!