stop loss strategy?

Just wondering what are the general thoughts on a stop loss strategy with GGE and the pending ANN. I'd like to set mine tight, but don't trust the domino effect knocking out a bunch of stop losses in a row, and plummeting the SP even if just for a very brief period.
Last weeks ANN (a good and very positive ANN) still dropped the GGE SP IMMEDIATELY following the re-open from 20c to 18c in a super short space of time (less than 30 seconds I think), before quickly jumping back up to 21c. It happened quickly, and I was busy checking my orders and stop losses to take full note, but I got the distinct impression afterwards of possible manipulation there somehow.

Saw a similar action with OBJ quite a few months back. Dropped through 8 levels of buyers from 42c through to 35c then back up to about the same level in less than 1 minute; in fact it could have been about 40 seconds from memory - I forget exactly - triggering stop losses en mass down the ladder and thus sending the SP to the next lower price to then trigger that level of stops.

I imagine there could be a bunch more shares under stop loss triggers than buyers at the same price in GGE at present, which to my mind could set off a similar downhill domino. I also noticed a single seller with 10,000,000 shares a week ago, sitting at 10c on the sell side. Dumping that in one hit could take out 2 lines of buyers which in turn could start further stop loss triggers down the line.

Please feel free to comment if you think I am misstating this possibility.

Just a thought ... and a caution to holders.