bit late but:
It might be better if whenever you kill a new tech unit, capture a city with a new tech building, whatever, you have an option which goes "we can reverse engineer from captured material X science for a certain related tech for Y gold, do you want to?"
probably depending on various factors the gold amount drops, killed units give much less science than buildings etc.
This could even be related to either a new leader ability like "inquisitive: -50% to reverse engineering costs" or it's a world wonder's benefits or something along those lines with the actual amount being tweaked for balancing
It might be better if whenever you kill a new tech unit, capture a city with a new tech building, whatever, you have an option which goes "we can reverse engineer from captured material X science for a certain related tech for Y gold, do you want to?"
probably depending on various factors the gold amount drops, killed units give much less science than buildings etc.
This could even be related to either a new leader ability like "inquisitive: -50% to reverse engineering costs" or it's a world wonder's benefits or something along those lines with the actual amount being tweaked for balancing