Your tractor has a bare chassis weight of 4200 lbs.
Are you running with a front end loader (FEL), or not?
You may need to run with either the FEL on, or a weight bracket and hang suitcase type weights on the front end, to keep the load balanced. I say "may" because with only running on completely flat ground, it may not be necessary. It just may cause your front tires to get light when you steer in a turn. Try it to find out. You may also find that if you're using your split brakes to turn, there is no issue at all.
I'm running the same chassis, with a cab and filled rear tires. I have always left my FEL on, with either the bucket (mostly) or forks on it. Where I mowed most frequently was slight rolling pasture, but with a couple of road ditches that got very steep in a few places. I never had any issues with being light on the front end, even on hills and climbing slopes.
However, I was running a 6' brush hog with no offset. There will be some differences, obviously. But where you are flat ground, I was contending with slopes too.
I think you'll be fine. I also think your rear 3 pt is rated to lift over 3K lbs.
Here is a link to the thread where Asteral posted up most of the manuals for Branson tractors. I know the service manual for the 25 series is on there, but don't know if the owners manual for the 25 is listed.
https://www.tractorbynet.com/forums/century-branson/419226-i-have-found-all-service.html