I have not used them personally but they used to be active on the forums. Hit the M3/M4 and F90 M5 forum as well to see as SFL has pretty strong group of folks from SFL. 954bimmerclub on IG might have some good leads. I drive an hour from my home in Riverview, Fl to get to my preferred shop. Keep us posted on who you end up linking up with and how things go.
These folks have some good review on google.
https://www.milestonemotorspb.com/
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2015 F06 M6 Silverstone Metallic II, Individual Full Leather, B&O, Night Vis, CCB, RKAutowerks (CP Rods/Pistons, DI Cams, CF Intakes, Coated DP's & Billet Diff Brace), InfinityAuto Turbo Inlets, Mishi Oil Cooler, JB4, XHP S3, BM S3