Weight loss or muscle gain?

I would say stick to what you are doing. Yes you need to lose 70 bad pounds, but that is fat and not muscle. Stopping your weight training now will lead to a decrease in weight but that will come more from a decrease in muscle m. You have been doing such a good job so why spoil all your hard work. You may not see any difference on the scale when you lose that bad weight, but your heart sure will.