It only takes a few minutes and is worth the effort. Just unclip whatever is holding the rod to the flapper on the turbine side(circlip, pin, etc.), and turn the rod end (the thing with the hole that went over what you just clipped off) a few turns tighter so that when you put it back on the wastegate flapper, you have to kind of pull on it a little to get it over the nipple. That will add a little extra pressure to the wastegate itself and stop it from possibly slipping open under boost.
Not sure where yours is in relation to the firewall but you might not even have to get under the car to do it.