I wouldn't worry about the ATP written. It is a stupid test and you don't learn anything from it. I took mine at All ATPs and I didn't learn a thing and had no problems when I upgraded. Best 300 bucks I ever spent. If you want to get your MEI then go for it but I don't think it is necessary, but it will help some. Letting student pilots try to kill you for a couple of hundred hours would be good for you though, even if you are only in singles. getting some instrument students would be good for ya too, assuming you are a CFII. Most of the pepole that wash out of training are poor on their instrument skills and knowlege. Most don't have too much trouble with V1 cuts and single engine ops after a couple practices. Good luck... and for what its worth, I think Lakes is one of the best kept secrets out there. I spent less than 3 years there and landed a job with a Major and have 1000 turbine PIC under my belt.