My view of espionage via the slider is that you are usually playing from a point of weakness. In this particular game I think it was utilized well as you had a stronge, peaceful techer near you. You also had the games best leader for this, philosphical to get the Gspies and financial to abuse the cottage cities. Nothing wrong with this, but just putting it in perspective, it is Liz.
I view espionage as a way to get a weaker techer (such as the warlords) to stay competitive until the vast amounts of acquired land adds up to a tech and commerce superiority. Hence I prefer to settle them and tech as I normally would. Less eps, but when directed towards a single AI, enough to steal what you want/need.
With that said, I like you idea of directing the slider to eps to steal what you need then swap back to research when techs are exhausted.
Some question/comments for discussion.
1) How long did it take to get those 4 GSpies??? Between the great Wall and a courthouse specialist spy to pop 4 GSpies even from Philosophical Liz is a greta job!
2) How much did Korea and Russia mistrust you as I assume at elast a few spies were caught for negative diplomatic penalties (not that a few dozen redcoats could deal with)?
3) Once you swapped to science slider, you have essentially wasted the Great People to attain tech parity as you have no Great Scientists and thus academies for a Financial leader.
Speaking of point three, here's a question. Is it better to get a building giving 100% eps towards espionage for tech stealing or an academy at 50% beakers towards research.
A good thread and I don't mean to be listing complaints. I have never really been convinced/sold on the espionage slider and the fatc that you are playing from a position of tech weakness..