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I believe weight (including aero) on the tire increases its traction regardless of if they're R-compound or snow tires, so you technically could go faster on oem tires by adding aero, but it would likely not be as cost effective ($/second) as R-compound tires, alignment mods, wider rims/tires, etc... I have tracked my 2018 M2 at BIR in MN, USA which includes a 150mph straight which ends with a 120mph turn 1 - the scariest part for me considering a lack of sufficient runoff area. I am interested in adding aero, but for me 2019 will be my first year with R-compound, wider rims and camber plates - not planning anything else. I might consider aero for 2020 or, I might look to get more HP instead through a new turbo, tune and E85 (aero sounds cheaper as I type) to increase the fun level. Not sure if that helps to compare my scenario with what you are thinking, but hopefully it gives you something to help you decide what you want to do.
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