I think how your body 'converts' Tibolone varies considerably from woman to woman, and from week to week. From the chat with my GP today my massive increase in libido in the 1st month is quite unusual, especially as I've not had any androgenic effects with it.
Now whether this is because I hadn't been on any hormonal contraception since my early 20's, and the previous HRT was only taken for a relatively short time a couple of years ago, who knows.
Much as I was thinking I'd like to try some extra testosterone, the risk at the moment of it 'screwing up the good of the Tibolone' for me isn't worth it, as I think I'm probably 95-97% of where I want to be and how I want to feel. If things change I know I can return to discuss it further.
I'll keep updating the diary as the months roll on though.