Are they paying you enought to pit perfect diamond grill marks on them? That many people that short a time grill marks on the go will be hard. No marks if the metal isnt hot and doing that many to order is not going to give you enough refresh time to allow the grates to heat back up. Ny strip is a good choice of steak for this though. Filet to expensive and thick. Ribeye is good grilled but that many and you are sure to have a grill fire or two from the fat dripping. I would definagely mark them off ahead of time and finish on the grill. If you continue to load and finish one grill at a ti e you should be able to have a goos flow. Ny strip especially an 8 to 10 oz is going to be thin and should cook quick as hell on high heat.