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I would trust RT's numbers over Sonic's. But you can also increase a spring's rate by cutting it shorter - a shorter lever requires more force to move. I think .75 will be good for you, but if you do end up needing it firmer, you could trim the spring to accomplish that.
.75 springs are 70.5% stiffer than the OEM .44 springs. That's about how much stiffer the springs for my EX500 were, and it was a night and day difference. Going from stock to .75 is fixing a major deficiency. Moving around a notch or two from there is just tweaking for perfection. Most people will benefit more from improving their own skills at that point compared to making tiny hardware adjustments to the bike.
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*** Unregistered, I'm not your mom and I'm not paying for your parts, so do whatever you want with your own bike. ***
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