from what im seeing you have (2006 Black/1397/brocks/air shifter/nitrous/ etc race bike @ 68"). with this you will get there. just keep chipping away at that e/t and mph. it takes time blood sweat and tears...oh yeah and clutches lol...
a 1.48 60 should put you in the 5s
weight does make a difference in 60. if your bike is set up for your weight it will help and get as much seat time in as you can
https://www.hayabusa.org/forum/garage_attachment.php?id=3711&attach_type=full
get a stock seat take the cover off. take a saw and cut the front off in front of the mounting bracket. trim the foam out to desired shape and have a upholstery shop re-cover it. mine has two parts stitched together...
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