About RF amplifier (tested at 1MHz)

Dear all,
i'm designing a RF amplifier(shown in figure),but i am confused how it happened when input signal level is more than 200mv?how can i avoid it only by circuit topology?
who can help me analyze the second case in detail?
Thanks!

The behavior of the amplifier at high input power is normal what you get, because it goes in compression (even I don?t understand the -26V from the last graph).
You can increase the compression point (P1dB) of the amplifier increasing the bias current, or if the transistor is not supporting higher bias current have to replace it with a bigger one.