Workout Board - Keeping It Going for 2017

A little background to start out - I am not a new years resolution dieter that is going to quit next week.

I started losing weight last year after seeing a picture of myself looking like dogshit and dropped around 80lbs in 2016 on my own using an elliptical, home gym setup and diet/supps. I started at 333 on Jan 4 last year and have been down to as low as 246 - I have more consistently stayed right at 250-253. I had a little lapse over the holidays but I am going strong again now. I typically do a full workout 5-6 times per week consisting of 4 miles on the elliptical and some rotation of arms/chest/legs/back/shoulder/core workouts depending on the week. I typically do this after work starting around 7-8pm.

Should I use whey or casein protein post workout / before bed if I am looking more to lose weight and tone rather than just build muscle. This is my main goal and I cannot find a solid answer online without analyzing a bunch of scientific test data.

What do you OT workout gurus think I should try next to keep things moving forward?