In the C-sources you can still see that a second write is made for PSoC5 devices except for the PSoC5LP version.
Interesting, I never assumed or experienced an issue with the DAC and in the appnotes concerning ADC -> DMA -> DAC there was never anything special for PSoC5 mentioned.
I've used hardware strobe synchronous to the DMA strobe. That works without glitches.
Ohh.. Thanks for pointing this out... I was not aware of this bug before.