Karma genetics strains are about quality not quantity. I've had some very slow growing phenotypes, with very low yields - but with absolute top quality buds. Based on my experience you can certainly discount the 'White OG s1' - all very low yielding.
With that said however - all phenotypes of Orange Sorbet that I grew yielded well. The best one was a foxtail bud phenotype which had a lovely jaffa-cake flavour and was also the highest yielder. I grew out one of the other phenotypes using the manifold method and pulled 6oz from it after a 6 week veg. So he certainly has strains with yield potential. Unfortunately that strain is currently out of stock.