Re: Full sunlight?
My first hive went in deep shade under my huge elm tree on March 2nd 2011, on the advice of the beek I got the hive from. At the end of July all bees had flown or died, wax moth larva and pupae everywhere, a few shb, slimed. I swapped her her cleaned eqpt for another hive with bees (no honey, almost no comb). I set up in full sun, built a screened vent to help with the heat, and have been fighting off robbers for a month due to the dearth and drought. But no shb, very occasionally a moth gets in and lives long enough to lay a couple of eggs. Moths do not like hot sun, I gather shb don't either. And strangely enough, I went from an initial mite drop of over 100, powdered sugared a couple of times, and my last 24 hr mite drop was either zero or part of a mite shell (that could also have been part of another bug.) I'm thinking mites don't like dry heat either.
For what it's worth, I'd go with the perimeter of your oak tree so you get at least half a day's full sun on the bees. I started there with hive 2, and moved them to more sun about 2 weeks later.
Time to be a gypsy again, 2014 will be my prep year, my bees want a better area with actual rainfall.