@MrAl. Thank you, i have gone ahead and connected the feedback to the emitter again and have both R1 and R2 30k now. The waveform across the coil looks like this now:
**broken link removed**
@ericgibbs: Thank you for the link, i will read the thread.
EDIT: I have read it, but my problem starts with connecting the coil after the transistors.
The pure XR2206 output waveform looks very satisfying (First image in post #6)
Also after the buffer it still looks nice.
For some reason my coil connection might be less than ideal.