Just throwing this house rule out there for anyone interested in keeping investigators alive and sane for longer. This is especially useful if you are "embracing the chaos" and taking investigators from one campaign to the next. The rule is:

You may remove 1 trauma of either type from an investigator by spending 3 experience points, or by not playing with that investigator for 2 consecutive scenarios.

Hopefully, somebody else finds this suggestion useful. Also, any feedback is welcome.