If you boot a working image on an SX280 and then check the PNP ID for the storage device (SATA chipset I would most likely expect here),
This gives you a reference point to work from.
After that, once you have imaged a machine that keeps rebooting, boot WinPE or mount the hard disk as a slave in another machine, then trawl through the c:\windows\inf folder searching the INF files for a matching PNP ID.
The inf file will give you a list of driver files required by the hardware, so you can then look for them on the hard disk, and compare them with a freshly downloaded DELL driver for the hard disk chipset on the SX280, and see if the files are different.
You could also try replacing the INF with the one from the downloaded drivers, and also replace the driver files, and try booting again. This does not always work as there may also be difference in the registry requirements, but if it now does boot, you at least know that the drivers for the SATA chipset need adding to DeployAnywhere.