Hi, I just rediscovered slalom after 30 years, I bought a Mastercraft boat which came with an old Kidder Pro Graphite Redline ski, 67" long. I want to get back to my old capabilities (ran course 32, 15 off) but I'm not there yet so I want to use this ski for now and when ready I'll buy a newer Radar ski I have my eyes on. I do like the Radar double boot bindings, I bought them and cant figure out where to place them on this Kidder ski. The current front binding is 80cm from heel of binding to tail of ski. I'm seeing on youtube that correct setup is supposed to be 74cm so quite a difference. Any guidance ?