I'm pretty sure that Suzuki's test riders are an elite cadre of retired anorexic ballerinas and jockeys. These wizened wee folk carefully determine the spring and damping rates for Suzuki's bikes, even the ones sent to the sturdy, well-fed riders of Europe and the Americas.
Even at just 70kg, you outweigh them (the whole lot) by a good bit.
It's either that, or Suzuki got a great deal on a huge ship load of piss-weak fork springs back in the early '70s and they're still trying to use them up.
Either explanation makes just as much sense. Suzukis have always suffered from very weak springing, and no one has ever quite figured out why.
I've measured too much sag on bone-stock V-Stroms without a rider aboard. If you have a preload adjustment, you can crank this up a bit, but the fact remains that the stock spring rate is far too weak for the smallest, gentlest rider.
2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
2005 KLR685, Aztec Red - Turd II.2, the ReReTurdening