I got a great idea for timing...... how about PROPER USE OF EYES.
It's amazing how some people describe it - "just wait a little longer, point at the play first, etc"
Timing is not just for behind the plate - it's also used on the bases for this exact reason. Once you determine a tag or if the ball beat the runner/runner beat the ball, then you shift your eyes/focus to the glove to determine firm and secure possession and voluntary release. If you use your eyes properly and look at BOTH aspects of the play, then you will likely make the correct call at the right time.