Very interestinginfo Mark.
I also use a lot of recycled timber and pallets are high on the list for use.
To get them apart I use brute force for example to get the first slat off I usually lever it off with a other piece of timber as with you I find the weak link to start.
Once this is off flip the pallet on the driveway, elevate the pallet by placing a block under the top slat and then thumping the bearer again displacing the slat and nails, repeat and I have a slat with the three rows of nails almost straight I then just bash the slat nail points down in the concrete to raise the heads then remove them. Mind you subtract about 10 years from the age group !!
Byproducts
Results
Regards Rob