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501F BPT and Exhaust Control
What's the difference between BPT and Exhaust control for Siemens GT?

I just started in as an intern and would like to know:

1. BPT/EXh are both temperature controller based on shell pressure but what is the purpose of BPT bias and how Exh trimmer works? I see that exhaust temp trimmer does not kick in till BPT temp control activates.

2. Also in the fuel circuit how CV curves are calculated, for FG valves?
Are they design curves and why measuring actual cv?

Thank you,