Options for 2015 Ninja 650 return springs

So my ninja 650 (non-ABS) has woodcraft rear sets, after using them for a bit I realized I wanted more pedal feel for the rear brake. I see options (on the woodcraft site) for pedal return springs for the ZX6-R, and ZX10-R but not for the 650. Is there another vendor that have return springs for aftermarket rear sets or maybe the ones from the ZX6-R can work? I believe woodcraft has a 1.25in spring and a 1.81in spring (mainly for the ZX10-R tho). If there are no options from vendors, Im curious what other 650 owners with woodcraft rear sets have done to get a more resistant feel on the pedal.