One thing to keep in mind is that the amplitude levels for the K5 are not linear.
There is a document in the files section of this user group marked "K5 Harmonic Level Scaling" It will show you how to scale harmonic amplitudes to K5 numbers.
But honestly, I had much better results doing it by ear.
What I found is that the K5 still has trouble creating waveforms like this, simply because it only has 100 increments to work with on the amplitude settings. With the exponential curve of a sawtooth wave's spectra, it doesn't take long for the K5 to run out of amplitude resolution, so the sawtooth wave ends after about 10-12 harmonics. As a result, the sawtooth wave will not be very bright and more organ-like in sound. You can try altering the curve and also cheating in some subtle extra higher harmonics. This will give you a brighter waveform, and a more buzzy sound, but it will also sound brasher and more digital, almost more like a pulse wave. Also, once you think you have a nice bright sound on the K5, the limited spectra of the synth will show up as bright in the upper registers, but duller in the lower registers of the keyboard.
The best piece of advice I can offer, is to look to the K5 for it's own sound. What I found is that It will never give you a classic analog-style sawtooth wave, not even close! Perhaps it was never even designed to do that! If you are looking for waves like that, you might be better off with a different synthesizer. But don't worry! There's lots of good sounds inside a K5! Once I faced the reality of that, I started programming the K5 on its own terms, and I got results I really enjoyed! Here's an mp3 of some custom presets I created, played through external EQ and reverb:
You'll hear some sounds that approximate sawtooth waves. On an oscilloscope, they would look terrible, but they still do the job and I like the sound of them. The string-machine sounds are bright, but more digital/pulse sounding, and the synth brass sound is a bit on the soft side, as well as not truely a sawtooth wave. After a while you have to follow your ears more than a textbook. Also, you might enjoy the K5 for its own strengths, like clangorous sounds, evolving waveforms, and it's own quirky digital style.
If someone else has different results, please let us know.