Navpilot 500 XTE

[Zephyros]

My setup is Mfdbb, Navpilot 500, PG500, Furuno RRU, GL330b, etc.
The problem I have had for a long time is that when using the autopilot on NAV setting, sometimes the XTE can get to a very large value of say over 200m before it gradually brings the boat back on track.
What's the best way to input a lower level of XTE into the system to correct this problem.

 

[Sparky Wire]

Looking at the 500 pilot manual it seems you would want to be in XTE mode. Odds are it is something related to heading or hydraulics if not staying a good course.