I seem to have most luck on bluff points and about 30 to 40 yards in , on main lake.
I also look for bluffs that have shelves not just straight drop offs. That's when I'm talking about sweet spots on a bluff.
They seem to like the little shelves.
I fish no more than 15' away from a bluff. I throw a Texas rigged 10" black worm. I hit the bluff and pull line off real so that it falls straight vertical. Once I hit the first shelf I crawl it slow as possible towards me to the next little shelf and so on. They seem to hit in the 12 to 15' range. Although I might be in 60' of water.
Don't count out bluffs in shallower water to, like 15 to 30 feet deep.
I myself keep the current in mind. On points for sure. They will usually always be on the current side.
As for schools... I don't personally think bigger bass 5 plus lbs. school like 12 to 15" fish.
They sit and ambush. Where schools follow the bait. The big bass I think wait for the food to be brought to them. So it's just usuall 1 or maybe two off a sweet spot.
These are just my thoughts and opponion, I'm sure it does not always apply.
And I even brake my own rules sometimes.