We've come across four "types" of oil starvation / pressure loss events with this car: sloshing, capacity, aeration, and "transients". Sloshing and capacity type losses are most discussed, most clearly observable (if you have a oil pressure sensor), and the most severe. In the limited number of data samples we've seen on road courses, we've so far only observed these events when approaching 1.0G lat. On centre handling is considered to be under 0.2G lat.
The cloverleaf test would essentially be a constant radius, variable speed skidpad test. This is a static/quasi-static test that would isolate for capacity type losses, so the idea is definitely valid. However, I would preferably perform this test on a skidpad or on a vehicle dynamics test area, but who has the connections to arrange that (unfortunately, not us, sadly)!
Which bring us to the slosh type loss. Throwing more oil at the problem (ie. overfill) helps as well, but when Subaru only gives you so much space around the oil pan, you have to do something else to manage these types of losses. Most of our testing has focused on road courses, but it would be neat to see oil pressure data for a BRZ/GR86 around an autocross, preferrably for an extremely technical layout.