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tokens: We thank Alex Heger for the data of his Z9.6 progenitor model, his numerous contributions in developing the KEPLER code,and many insights into the topics of this paper. The help of Feryal zel withcomparing our neutron star masses with observational data and of Gabriel Martnez-Pinedo with our analysis of 19 F production is also appreciated. T.E. and H.-T.J. thank L.Hdepohl, T.Melson, M.Ugliano, and A.Wongwathanarat for numerical support and R.Hix and F.-K. Thielemann for providing the NSE solver introduced into P-HOTB by K.Kifonidis. This work was supported by NASA (NNX14AH34G) and the UC Office of the President (12-LR-237070). At Garching, funding by Deutsche Forschungsgemeinschaft through grant EXC153 Excellence Cluster Universe and the European Research Council through grant ERC-AdG No.341157-COCO2CASA is acknowledged.