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The inside of the petrol tank cover has the range of unleaded octane fuels that can safely be used on the E90.
The 330 is certainly one that will benefit from the highest possible up to and including 98RON. (Equals about 95PON for USA)
Rough idling when cold is something different. I think you are going about showing your dealer in the right manner and if they still are unsure, check with another dealer.
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328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect, MST turbo intake pipe, MST Cold Air Intake, JB4 on Map 2 with Catless DP produces awesome performance in Sport.
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