Gas Boot Level control Cascaded to Split Range Flow

Hello Emerson 365, 

I am dealing with looking the end of the sales train and focusing on the Stabilizer (Gas Boot) Level control. Currently the Control scheme involved two individual FIC controllers; One for min Flow control and one that controls flow to sales. I had an idea and though I would look for advice. The Pictures attached below help explain my idea. I was thinking of having the LIC cascade a setpoint to a FIC. Then use the Split range control method to control both the min flow and the sales valve. This would make the valves work together instead of working against each other.

Here is an example of what occurs on a daily basis while shipping: 

1)Stabilizer level Starts decreasing rapidly

2)Sales valve begins to slam shut

3) Min flow valve cracks open because the overall flow begins to decrease rapidly because the sales valve is closing 

4) Stabilizer level recovers and sales valve cracks open again

5) Min flow valve closes and send even more flow to sales; decreasing the level in the stabilizer.

This is causing cooling issues on the sales cooler because it is increasing flow by about 20-50 m3/Hr every 5- 10 minutes. Not to mention the Rapidly changing diff pressure on the cooler plates. 

Below is the control structure I would like to try out. 

This Trend shows the 42.8 Controller Split range that I came up with 

May bring this one up to engineering for a trial. Let me know your thoughts.

If anyone else has tried something similar to this, please chime in! 

Thanks, 

Shamusk