I take it that you mean P-states when you are referring to Zen states. You should make a back of your settings in the profile manager before starting to play with P-states. Then if things go awry, you can reset to default, then load up your good profile. If you cannot find out what you have messed then a reset to defaults is your best option.
I highlighted all the settings that you need to change to get P-states to work
here. A table on how to set your voltages is
here:
All this was taken from a guide on Overclockers forum.
If you are getting crashes, then most likely your voltages within the P-state are wrong or/and your soc voltage is out. I work on soc voltage of 1.0250v and CPU @1.35v. It downclocks to 0.89v.
EDIT: I forgot to mention I set my cpu voltage to 0.0625 + offset. It was a tip someone posted to help with stability on heavy draw. I have no LN state active.