OK, I am taller than you, the 33.1 inch ride height is a deal breaker for me.
...that would be a total of 120mm lowering...and reduce the 33.1 inch ride height to 28.3 inch...which would be great for my size.
I can't imagine why you couldn't use both the spring and the lowering kit together. Even with just that you're looking at a 2 3/4 inch drop. How short are your legs? I'm 5'8" with a 30" inseam, and I'm so far dealing with the stock height ok, though I'm considering the 40 mm lowering kit, or the seat. It would be one or the other though, I don't want it too low.Would it be possible to say get the Streetfigther height adjustment kit (lower by 40mm) and the Hyperpro rear lowering spring (30mm) together? Would this give a total of 70mm lower ride? Would this affect the ride?