You have a grandfather on one side with European blood woody, the rest is typical nz lines... related to my old sweep in fact, 11 years old and still going strong, his dad was one of stugs 3, we bred 2 litters from him none of which was breeding material.
As stated the gene pool is hiding many issues compounded by inbreeding and lack of a benchmark to breed against.
The root stock being English came with health coat and temp issues... none of it is a good thing and the gwp gene pool still has it.
The lack of new bitch lines was the biggest reason.... bringing in new males was not the answer.
It is identified and eliminated from the breeding gene pool in the drahthaar world when it come up.... hence the testing they go through.
Some of the eastern German lines were known to be very aggressive and big, looking at old pics of the nz foundation stock they looked very similar.
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