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Use the whole "pad" of your finger (or thumb) when typing, not just the tip. In other words, position your finger as if you were trying to leave a "criminal" fingerprint on the key you are selecting. Tap, don't press, however. 

Also, for "problem" keys (mine seem to be O and P), keep your finger on those keys for a tiny extra fraction of a second. If the zoom reveals you hit the wrong one, don't lift and try again -- just roll your finger left or right to grab the correct key. 

These two tips made a huge difference in my accuracy and speed.