Hey man -- I wouldn't change props until you know both motors are running correctly.. The other motor would not run incorrectly based on the opposite engine being bad, if that's what you are asking. However, it's effectively doing all the work, especially at higher rpm, and being "dragged" down my the low performer of the pair.
Don't change a thing until you get it fixed and back on the water to get a baseline of where you really are with both motors making full power. Buying anything until you get a good baseline is like throwing money into the fire. You may need different props, but you'll be able to figure that out pretty accurately once you get this baseline.
It's going to be a long winter, for both of us