What would cause a pot to range from 0.00 - 3.55 instead of 0.00 - 5.00 volts? Is it because it's 270 degrees?
Only turning it 71% of the full range would cause that.
If you need to use that pot because pots with smaller ranges of motion are are hard to find, either try calibrating it in Windows
or look into what Le Chuck did
here to mod his Star Wars Micro build yoke pots with conductive ink.
Scott