Interesting you're experiencing the same problem. There's been a couple of times (both during light holiday trading) where I noticed the price has spiked down sharply taking out all the stops, shortly therafter returning to where it started, creating what I think are sometimes referred to as spider legs?! I'll dig out the chart and post it here when I've a chance to run through it.
So can anyone confirm... Are orders that are placed 'stop limit' on ICE actually visible on the floor before they hit the execution price? If they are not, then it seems to be that traders are running prices through the most obvious places (just below most recent lows, or just above the most recent highs) with the lack of liquidity contributing to the bad fill; but if these orders are actually 'visible' ie the price and number of lots you want to trade can be seen by others prior to the order being filled, then I'll make sure as hell not to use them! Thanks in advance if anyone has any info.