I play the same. I play slower when I am behind and I do this sometimes when the opponent gets cocky.
Clockwise ?
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My advice is, don't be a clock sucker. Just move quickly and get on with it. If you presume anything based on a potentially fleeting advantage it could be the end of you.
If You gain some material against about an Even Rated Opponent, do You ...
... play slower after getting as the Upper Dog ?
... keep playing the same pace as earlier ?
... hurry up to win the game quicker ?
What is Your Way to use Your Chess Clock ???