No problem
I think it would be great, not sure why it would be a bad thing, unless it's extremely pricey. As long as it does what it says, I think it would be great.
More weight has only made the ride smoother for me. Think about when driving a big 3500 or F350 pickup empty vs hauling 1500 in the bed or 15000 behind the truck. Your ride will be a lot smoother because the shocks on those have such little flex in them that the extra weight will make it more springy like a car suspension. This same thing is true with the tractor, except a tractor has no suspension. THe extra weight will keep the tractor on the ground instead of bucking it all around. I have my tires full of calcium in the 5410. Calcium's definitely not my first choice now, but it was the only choice 12 years ago. I don't remember the exact figure, but it was a couple thousand pounds. I have lifted 3 large square bales at a time without the rear coming off the ground. Mind you this isn't the best practice, but I have to move them in a very tight barn where I don't have space for anything off the back.
As far as only going half full, that's a bad idea as well because when the air and liquid mix it will rust your rims. You should always either go 100% full (or just enough to cover the top of the rim) or 100% empty. Somewhere inbetween you will experience the same symptoms as calcium filled tires these days.