guys
i have also looked into this, although i havent tried it, if you think about it, if you in effect shorten the amount of travel on the actuator the effect will be somewhat like an oxy torch where you have hot gasses comming out of a small(er than usual) hole, in this case the wastegate, and burning the wastegate, which in time would become burn on the edge in the same way metal is cut using an oxy cutting flame.
so be carefull...
but like i said this is all only in theroy, it may be different when put to practice, as most things are