I'm no doc, but I'd give it a few more cycles too. But you know that BBT is a SECONDARY indicator for fertility and your PRIMARY indicator is your cervical mucous and position. When you have wonky BBT's I would go with your mucous patterns. BBT is only good for showing if you might have ovulated, where mucous and position PREDICTS fertile windows.
So from your charts I would say you ovulated a lot earlier and your LP is a lot longer than 5 days.
Start taking a B-6 vitamin. Extended use of that can increase your LP by 3 days or so.
You can also increase the consistency and amount of mucous by taking over the counter cough medicine (US name Robitussin).
If you are found to have a LPD (luteal phase deficit) your doc can prescribe progesterone which will also work to increase your LP. There are a lot of forms and dosages. But the first step is to make sure you have a LPD.
Along with BBT, I see you are charting mucous, do you make an internal or external examination of the consistency. If you don't have a lot, or you're worried about the consistency, you may check trying "at the source" so to speak, IOW check the mucous at your cervix to see what it's like, and chart that. You may be missing a window of fertility because your charting mucous that's a day old. (You don't need to comment on this part, just food for thought

) At the same time, you can get a feel for what your cervix is like and what it's cycle is like.
Things to note, chart the most fertile mucous you have for that day no matter what the time, but chart the POSITION of your cervix the same time every day for the most accurate readings.
