I held for years all the way to 87ish then on the drastic drops thought sod this - lost a packet just like Dixi and have yet the confidence to buy back in - although saying that I have been curious and a little green at the quick bounce. In my experience things take a lot longer.
I think this may drop and bounce again before it puts in another spurt - but good news will obviously see it spike, and bad news the contrary - depends of course which comes first?