I had a P85D model S and all I can say is that is probably the only car I have ever regretted buying.
I live in MN where it is freaking cold most of the year which reduced range by half if not more(after all heating elements are on), then there was the struggle of going to charging stations to find them all full( this was back in 2014 before there were apps telling you the status of the stations).
But what really pissed me off was that 3 times I went to my car and found it in "limp"mode after an over the air update was applied and failed updating(without my knowledge I might add), the fact that they can screw with your car without even saying a thing and things can go wrong which then you are forced to have the vehicle towed to a dealer which then says they are backed up so they can't touch the vehicle for several days and they have no loaner available, sorry but for something that cost me 100k the service I got was mediocre at best.
One of the reasons I avoided Tesla was how much control they have over your vehicle. Going in to Limp mode for no reason would piss me off.
I'm really surprised that you lose that much range in the winter...Tesla's are known for their battery management. I know in my leaf I only lose about 8-10% in the winter.