There is no "Erratic Behaviour Trim" checklist in any 737. Max or otherwise.
Checklists are a troubleshooting aid/guide and are not an answer to every conceivable issue that may arise.
Some people are inherently better at troubleshooting logic than others.
For a good example of this see the recent Southwest diversion to PHL where the PF used a checklist AND her brain when she flew her own flaps and airspeed.
You can't train for that.