Howdy from another Pennsylvania neighbor, and welcome to MyTractorForum!
Yes the difference with what you've done is as clear as night and day.
If you move onto heavier tasks, go with R-1 ag tyres, 7 gallons of Rim Guard per tyre (if you're in an environment where it freezes), use chains, and 100 - 200+ lbs of cast iron wheel weights per tire, you'll notice an even larger jump than the one you recently experienced.
I pumped 7 gallons of water into the turf tires of the 2011 GT6000, and the difference was huge. The GT6000 only cuts grass and pulls an occasional load, so at the moment, there's no need for bigger guns.
I recently put F-2 tri ribs on the front of the 2011 GT6000, and the steering wheel's not only exponentially lighter, but also the tractor turns much better now.


Cheers and again, welcome to the forum,
bolillo
Yes the difference with what you've done is as clear as night and day.
If you move onto heavier tasks, go with R-1 ag tyres, 7 gallons of Rim Guard per tyre (if you're in an environment where it freezes), use chains, and 100 - 200+ lbs of cast iron wheel weights per tire, you'll notice an even larger jump than the one you recently experienced.
I pumped 7 gallons of water into the turf tires of the 2011 GT6000, and the difference was huge. The GT6000 only cuts grass and pulls an occasional load, so at the moment, there's no need for bigger guns.
I recently put F-2 tri ribs on the front of the 2011 GT6000, and the steering wheel's not only exponentially lighter, but also the tractor turns much better now.


Cheers and again, welcome to the forum,
bolillo