DS4 is not Bluetooth. I don’t think the LED contributes any significant power drain at all. I honestly think they didn’t want to make the controller larger accommodate a bigger battery. Now can people please put this idea of turning off the LED to bed please?
This is not unusual for a game to not have fully baked SLI support. Trials had a problem when if first came out that SLI would slow it down to single-digit FPS unless you turned SLI off. The profiles usually get updated with driver releases. It can only get better.