Hmmm, a lot of questions all wrapped up in your post there Blake...
At this time of year, I really like to know what is under the snow, 2-3 feet of snow on top of a grassy slope is a lot more of a hazard than 2-3 on top of a field of large talus. The underlying "texture" can make a big difference to how well things are anchored.
I don't see why a rutschblock would not be possible in that snowpack? Perhaps you could explain why you think it would not work?
I would be wary anytime I see natural slides occuring, this is obviously an indicator of some sort of instability. I really wouldn't be describing something as "pretty stable" if I saw slides occuring! In fact I would call it quite unstable.
Sticking to unexposed areas is a great way to be safe, if by that you mean areas that are not possible to slide, and are not exposed to possible slides from above.
There are really a couple of elements at play in the winter risk management game - probability of an event (avalanche) and consequences (if one happens.) The probability is the tricky one to predict, but there are sometimes obvious signs (whoomphing, cracks propogating, natural slides occurring) and other times you need to dig in and have a look at the snow.
The second part of the question is easier to answer, Look around you, get your head out of the snow pit, and ask your self, "What if?"
What if the slope in question slides? Is there enough snow to bury me? Is there a terrain trap (gully, bench, streambed) that could make for a deeper burial? Maybe there is a cliff just below you, and a slide that is not big enough to bury you could still knock you off and kill you.
Unfortunately there is little science in avalanche prediction, at least at the level of techniques available to the backcountry traveller. That said there area lot of things that you can do to make your trips safer, and more enjoyable. Taking a basic avalanche awareness course is a good first step, and getting out in the b/c with experienced people is vital IMO.