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Make a fist like you did in the other methods, but then concentrate on just one finger. You may be able to get a louder pop if you dedicate all the pressure to one finger. With the thumb of your other hand on the finger you're going to crack, hold the hand you're cracking with your other hand. Press down one at a time with your thumb either on top of your finger or pressing down near the tip to crack the top. Instead, put your hands together like you're clapping, similar to a praying position. Your fingers and palms should be touching, mirroring each other. Then, move your palms apart, keeping your fingers pressing together. Press them harder and harder together, moving your palms upward, until you hear your knuckles cracking. You may need to rotate your hands a bit. Dead on your middle and ring finger should crack, but with a little twist, you can focus on your pointer and pinky fingers. There's two ways you can do this: Take one hand and wrap it around the finger you want to crack. Then swing that hand while you hold the finger stable. It takes a little time to perfect, but you can get a good crack out of it. You can do it for the top joints, too; just grip a little higher. Grab the top part of your knuckle with your opposite hand and give it a twist. Basically, instead of twisting your cracking-hand, you twist the hand doing the cracking.
Or take it one finger at a time. Experiment with cracking your knuckles without making a fist. Try cracking your knuckles by twisting.