Feko optimization engine management (feko's own engine)

After years of working in HFSS, I am trying to master FEKO, and looking how to do the same things I was able to do in the former software.

Of particular concern is the optimization engine. Here please allow me to ask four questions

1)when I define a goal, let's say Maximize: (log(avg(Focus)))*(10), where focus is a realized gain in single defined direction, when I plot this partial goal cost and the gain dB together, the numbers do not match. See the image.
So, what is the cost of a single defined goal then?

(here the direction is a far-field point, therefore the average function, to workaround if there are more than one point by occasion)

2)Is it possible to plot a requested parameter, like Gain versus iteration? not against frequency, or angle, but the optimization step.

3)When I have the cost vs. iteration plot, and see the iteration I think acceptable, and know its number:
 Is it possible to apply the values to the model from that particular iteration, by the number I choose?
 
4)How a simple quasi-newton method (gradient descent with extrapolation, etc) is called in FEKO? When the area of solution locking is known, Quasi-newton methods work the best.