My thoughts are this ...if I had another M3W ...and I would love one if I had the garage space ...I would but a post 2014 car version with the rear Louvres) or 2015/16.
I do believe the car/these later versions are now pretty well sorted ( mine was a May 12 car) .
Thats exactly what I'm thinking also.
BTW, looking at your Sig and location, you weren't at Tewkesbury classic car show few weeks ago were you, saw an Ivory 4/4 on display?