Unfortunately this problem is specific to the Coupe as the dot matrix is much wider.
I had the same problem but when they removed the tint to try and fix it they ruined the heater demister bars and nicked the headlining. They (Tint-A-Car) denied liability and in the end I claimed on my car insurance and replaced both the headlining and the whole back windscreen!!!
Once that was done I had my BMW dealer re-do it. They specifically don't tint over the dots at the top of the windscreen, they just leave it untinted, which looks fine and is the best solution.
There is a product called Dotmaster or something like that which some tinters use, but it doesn't really work either. Others actually try and file down the dots using steel wool.
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2011 E92 335i M Sport Coupe/DCT/Black Sapphire/Oyster/Bamboo Grain/Sunroof/OEM Performance Exhaust/Individual Audio/Heated Seats/TV/Folding Mirrors/6FL iPod/6NF Extended Connectivity/Internet/ACS Roof spoiler/ACS Aluminium Peddles