If you want to lean your (Experimental) Jabiru you can:
HACman Mixture Control Order Page
I know nothing about the company, and I wouldn't fit it to my own aircraft. I reckon it would be a gamble whether leaning improved the current situation or made it worse. If I had to put money on it I would guess it would make it worse, but I don't mind being proved wrong.
If you try it, please report back...