To get back to the original driving distance question...I've found that with my R9 ("old" version, equivalent to the level 62+), on STA, if I add a little topspin going downwind, my drives will usually end up longer (sometimes MUCH longer!), than if I use backspin. This is probably due to the "back-side of the mound" feature mentioned earlier in this thread. Just bear in mind that your ball will be rolling much sooner and much farther, and will therefore be much more affected by the slopes, mounds, dips and other weirdness in the STA fairways. I've had plenty of 350+ drives that were "dinged" but ended up a foot off the fairway because of strange bounces and rolls.
On the other 3 courses, backspin generally seems to produce longer drives (in my experience, anyway).
Of course having said all that, my longest drive (410 a few weeks ago) was hit with full backspin (and a hefty tailwind). Call it a lucky bounce....and an even luckier roll! Gotta love those double greens on STA!