@roy: Cutting off the gold plated parts surely increases the yield! The data for the yield was based on complete pins from PCI connectors, memory connectors aso. If you have the time to cut thoses parts off, you should also calculate time as an investment
Look around in this forum, we have discussed the pin yields many times, you wont find anything higher than 1-2% for a full, uncut pin. lower than 1% is even more realistic.
The yield in my book was documented with an analysis from the Allgemeine AG (http://www.allgemeine-gold.de
), Germanys largest and most competent refiner. Their labatory reported 0,1%-0,2% Ag and 0,1%-0,2% Pd back.
Last but least, it is not accurate enough just to weight the foils! You must dissolve the foils and then precipitate and then weight again! You will wonder how much mass they will loose in this refining step. The foils are by far pure gold. They often contain nickel, copper and other alloyed metals. You only weighted the raw mass of the recovery.
So we must compare under equal conditions: Use your goldpins without prior cutting them, just as they are. Dissolve the foils and precipitate the gold. Then weight the result and tell us again what your yield is.
I bet it will be rather 0,56% than 5,6%.