Been doing some research and some folks say they get floating steering with deep void MTs for a few 1000 miles at first. They are maxxis rzr MTs (no not the UTV kind) i wonder if thays it
Some tires have stiffer sidewalls than others. So that can be a factor, along with inflation pressure.
Any time you alter a vehicle, it is likely to act and feel differently. Bigger tires, suspension lift, body lift, different bushings, different shocks., etc. The key is to make sure the changes you make are well designed so they work properly and safely. Most important is to ensure you don't have worn out components like bushings and ball joints, steering shaft components (like rag joints) and whatever. When troubleshooting an issue like this, I would recommend;
1. Check for worn or broken components.
2. Check for things that are out of adjustment.
3. If all that is good, then what is the last thing you changed before noticing that it "doesn't feel or act right"?