Hi @Jimr ,
Welcome to the Troubleshooting forum section.
Your description matches the known current firmware release limitations.
Note that what people often try to do is to cheat the left-right motor distance to pull up the center.
However, Recent research has shown that the importance of some parameters were underestimated: chain stretch and chain tolerance.
We are collectively in the process of improving the Maslow software, and we have an improved solution in beta test. To finalize this very promising improvement, @Joshua has designed an improved firmware /Ground Control and calibration for the MaslowCNC.
Would you like to try it out?