That rockiness could be due to the way you take your temperature but as long as there is enough stability to see the ovulation pattern it probably isn't too big a deal.
The only thing I could say to smooth it out other than the usual (making sure you take your temp at the same time everyday, on 4 or more hours of sleep, keep your sleep habits consistent, take it the instant you wake up, etc.) is that you could try temping vaginally. FF says that is a recommendation for ladies who have very rocky charts.
Hope it smooths out for you! We don't want you lost in the outback

Watch out for kangaroos until you make it back to the smooth road.