There are without doubt much more experienced south Maldives divers than me that can chime in, but for what it is worth, I was down there on a two weeks trip in April. I used my EF 8-15 fisheye with a 1,4 extender, and that was almost to wide for the encounters I had. The sharks certainly did not come close enough to even consider using the 8-15 bare. I used no strobes on the shark dives. On one dive, a group I wasn´t following seemed to get close encounters, but as none had a camera in that group, it is hard to evaluate how close the sharks actually were. With regard to the current, we used reef hooks on the shark dives, and there would have been no real issues using the strobes if the sharks had come close enough.
On more reefy dives though, the 8-15 bare was fine. There are some amazing hard coral formations there that are worth doing. And some turtles that could´t care less about people.