20% all around you can't go wrong! I had the same dillema as you and I don't regret at all with going 20% everywhere.
35% wont save you a ticket so might as well go 20%
2017 F87 ///M2 DCT - LBB - Msport Exhaust
Retired: 2011 E92 ///M3 6MT
Retired: E92 335xi Msport FBO
Retired: E92 335i - AW - FBO