Looks like you did have a tough time with the hard soil. I have 3 things to say....more weights, more weights,, then more weights!
The turf tires like on Mike's Allis do well if you chain them. You guys also need to put a weight on the rear of the plow itself too. Really helps getting/keeping the plow in the ground with tough soils. If trash is a problem, take the coulters off. Half the time I have to take mine off, or run them as high as possible. Fill the rear tires, then add as much weight as you can, mostly on the left wheel.
regardless of the tough plowing conditions, I'm sure you guys had a blast. Next time you will be better aware of things to do ahead of time. It does take some time to get things dialed in, so a 2 day event will help with that.