Harriers made a double substitution 74 minutes into the game when young midfielder Davies and veteran forward Durnin replaced Doyle and Ducros who both enjoyed impressive games.
Hadley was having a busy time in front of goal and he hit the post 15 minutes from time after Davies' left wing corner was missed by everybody.
The Kidderminster striker pounced at the back post but could not make it 4-0.
Davies swung a fine cross-field pass to Corbett to race onto on 86 minutes but his near-post shot was blocked by keeper Sheffield.
Harriers have been good value for their win in front of a crowd of 3,321.
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