AoA

I have been watching this thread for several days,
we are not going to get practical AoA displays for
gliders in the near future so how is the best way to
get it right as often as possible?

We have the ASI, Attitude and Feel and I guess that
we all use some combination of all 3 to fly efficiently,
so what is efficient?
Is it Best L/D or Min Sink or in between or in a flapped
glider the same AoA with a different flap setting?

For circuit and landing it cannot be Min Sink that
is much too close to stall speed so circuit AoA would
have to be different to thermaling AoA at the same
flap setting.

Any comments

Dave