Proper technique (octaves in Schostakovich Prelude & Fugue)

[pies]

What is the proper technique I should use to play the part in the red box at a somewhat fast speed?

[rimv2]

Assuming there are no sharps or flats in that box 1-5 all the way throught works. Or if you want stupid legato (or legatissimo as its called) try 14 15 14 13 14

The choice is yours and yours alone

[pies]

I use 1-5 throughout that passage. But I'm not asking about the fingering. I'm asking about the technique.

[faulty_damper]

The technique that seems to be most natural to me is to allow the motion of the wrist extending up and down to also move the forearm down and up because these two parts will want to balance each other out.  Since the hand is lighter than the forearm, the forearm movement is relatively minimal

The wrist is higher than when playing the black keys (on the black keys, it will be level).  The angle of the fingers is at an angle upon touching the keys (for me, it is about 40 degrees).

The forearm stays aligned perpendicular with the keyboard while the shoulder moves the arm.  This reduces the movement of the fingers attack upon the keys.

For musical accent, the first beat of the measure would be played with a slightly lower wrist than the rest of the cluster.

[rimv2]

The technique that seems to be most natural to me is to allow the motion of the wrist extending up and down to also move the forearm down and up because these two parts will want to balance each other out.  Since the hand is lighter than the forearm, the forearm movement is relatively minimal

The wrist is higher than when playing the black keys (on the black keys, it will be level).  The angle of the fingers is at an angle upon touching the keys (for me, it is about 40 degrees).

The forearm stays aligned perpendicular with the keyboard while the shoulder moves the arm.  This reduces the movement of the fingers attack upon the keys.

For musical accent, the first beat of the measure would be played with a slightly lower wrist than the rest of the cluster.

If its just for those notes, slightly raising the wrist then lightlytapping the keys will work too.

[pies]

Even with the tips/advices and relentless practice, I have not managed to get that bar down right.
Why do I keep coming back to this instrument? 

[timland]

First try working on going from the B octave to C octave. Keep changing from very slow and firm to as fast as possible with a slight accent on the last note. If you start to feel a lot of tension, drop your hand in your lap and rest for a few seconds.

Then do the same starting with C to B. Do it a couple times very slow then a few times as fast as possible. Try to play lightly when fast.

When you can easily do B to C  and C to B.  Do the same thing with BCB. Try to just think about the final B.

After you can do BCB very fast, work on B to A, Then A to B then  BAB

Then play BCB  pause  BAB.  Eventually you should be able to go BCBAB.