Wow! That's amazing! A great loss in such a short space of time - well done!
I'm not anywhere near target - I'm not even sure I definitely know what my target is haha - but at my group, those at target or almost there say the same as you - that the last few pounds are the hardest to lose. I remember my consultant advising them to try reducing their syns from 15 to 10, to see if that makes a difference, as well as mixing their foods up a bit.
Do you attend group or do it from home? I'm sure there are people here who can help and advise you - it might be worth having a look around the forum and finding those target members!