When did you change to synthetic oil? (At how many miles?- Was the car on petroleum oil for how many miles?)
1 qt in 3000 miles is considered normal consumption. I know it seems like a lot, but to Volvo it would be within normal. My 855 uses a qt in roughly about 7-8K...but I don't let it get a qt low then top up.
I guess I have more questions: What does the dipstick indicate when you shut down after you get "the low oil pressure light coming on for a split second during aggressive turns."?
Maybe the oil pump pick-up is going dry by the centripedal forces. I would just make sure that with your kind of driving keep the oil well topped up.
You could have a leak down cylinder pressure test and maybe there is an issue with the internal oil pump o-rings
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