I did set my monster level up to "Expert" and got two bacsinets and a bastard sword from the Trynnie Spirits.
I encountered some "Stalker Seekers" too...some orange and black marbled big lizard thingies but had to drop the game for RL! AGH! I did not encounter them again in the reload and haven't seen 'em since.
Did you start with your monster level set to Expert? I can't seem to get any more than one encounter more than the ones that are set with the game.
Do you go out and then come back in? (That's how I get the metallic slimes I think)
Do Tell! I won't have much time to fiddle with the game this week having to concentrate on school M-F, but would like to discover the best tips for the best stuufffffff.