I've got a 275/30 front. Maybe it's the AD08 sidewall, but I don't feel that I have lost much if any front end feel/crispness of turn in. Part of that is also down to the increased level of grip and responsiveness of the Yoko's v PS2s.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18