How to utilize programmable delay chain?

Can you attach the SDC file you used? The reason I went with the same-edge capture is because the DQS signal only pulses once at a very specific time. It is not a continual clock, so telling the tools to capture it on the next edge shouldn't be correct....Unless this is merely a way of lying to the tools and it will all work out.

You say that the clock is on a fixed path (meaning I can't apply a delay chain?), but figure 5 of AN 348 shows a diagram with a programmable delay chain on DQS, essentially doing exactly what I need it to do.