Tennessee Eastman Problem

Hello!
We're working on Tennessee Eastman Problem. For controlling G/H ratio we added a ratio controller cascaded with D feed flow controller.
The settings for the master (G/H rc):
P:1
I:1
For slave controller
P:-1.2
I:-1.2/0.9
D:-1.2*1.2
and the response we got is attached below. Based on your experience in control what do you suggest we do to get a 50/50 G to H ratio?
 

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