To fix SLI performance is a must to use flag #12 (0x084010F5 bits for example) but those produce flickering in some light zones around a few torches.

Using Tomb Raider (2013) bits produces negative performance scale in some places.

Furthermore (no SLI related), the Depth of Field effect reduces the color precision. Forcing HighPrecisionRT = 1 in registry doesn't fix the problem. Example (brightness/contrast increased to stand out the problem):

DOF disabled

DOF enabled