If we win this series, then why change? Obviously something is working. Fielding has been good, bowlers have been keeping it tight. Batsmen are playing with a plan, trying to occupy the crease.
Instead of going on another massive hunt for a HC, just keep these three and perhaps get a specialized batting coach. Also we should get another McIness/De Winter type of coach for the Under 19 team so that we get better trained players from age group cricket.