o.k. cheese you started lifting weights about 2 months ago and I will be honest and say that you have done well. Most people don't even stick with it this long. You have made quality strength gains and that is what matters.
Now part 2, I completely agree with BW and Mule, there is a point where you have to realize that you can only train as hard as you general conditioning level will handle. You can't handle the volume and intensity it will take to keep progressing at the same rate without a greater work capacity. The science being this: your anaerobic system uses oxegyn to create atp for energy at a cellular level. Anaerobic capacity is improved by doing things that last between 3 and 60 seconds. In short interval type training.
The one thing I wouldn't do is just walk around with a sled all day. There are many efficient ways to increase your work capacity and sled dragging is only one. Your bodyfat is not much if any different than your first pics, but you have gotten bigger, that indicates some hypertrophy. What you need is to not worry about your bodyfat in the sense where you are trying to lose weight, but you do need to clean up your diet and add interval sprint work, sled dragging, plyos and continue the event training. You will be at the right bodyfat when your endurance is good in these exercises. If what you want is to powerlift, then get your body in shape to the point where you can train at your full potential.
Oh and the thing about overtraining is that if you can't handle a moderate amount of gpp and extra work, then you are not in good enough shape, don't back off the conditioning work. If you have to back down in your workouts then do it.