There are some things you could do to improve your aptitude in this area.
Work on arpeggios and scales in octaves, both hands together and hands separately. No pedal! Get used to producing a sound that is detache, forte, and very rhythmic in a steady, not-too-fast type of way. As you develop strength and suppleness, your control over the velocity should increase.
Also work on four-note chords in this manner. You should be able to play all of the chord patterns, including tonic, V7 and dim7, in all keys with equal ease.
Try playing root position V7 chords in both hands, again forte and detache, starting in C major, and going through all keys chromatically. Go at the pace at which you can control the tone coming from all fingers, making sure the chords are struck cleanly and solidly, without having to slow down the rhythm of the exercise to find any particular key.
Once you have developed a professional-level technique, you will be able to complete this exercise with terrifying efficiency and power. I can easily go all the way up and down the octave in under five seconds, chords fff, both hands having equal control.
Have you played any Etudes by Chopin?