lol, i sometimes have this issue (closing out matches)... for me i think it's about choosing the right gear.
sometiems if i'm so far up, my opponent will change gears from say 4th to 2nd or 3rd (ie. to make me earn it)... so i have to choose the right gear to match the ball being given to me...
i might have gone up in score by playing 3rd gear, and maybe they were over hitting, then all of sudden, then down shift to 2nd or 3rd, i'm not longer:
(a) getting easy UFE
(b) the 4th gear pace allowing me to be more conservative in my swing
(c) forcing me to hit more balls (eg. instead of winning in 3 shots, maybe now we're going to 4-5 shots)
etc...
takeaway from this is that i need to make sure i'm practicing hitting shots with consistency, depth, placement.. using all gears... and being able to execute the gears out of order...
(eg. moonball, high&heavy, short ball drive, slice, etc...)
i know when i get behind in a set, i go into "shot tolerance mode"... ie. i'm gonna make you hit many balls, and force you to take more chances to finish me out...
when folks do that to me, and i recognize they're in "consistency mode",... i start counting how many shots i can hit in a row... and make it about the mini goal of "how high can i go" rather than trying to finish out the set... and rely on my practice to recognize the right ball to attack (if and when i get it - eg. mid court, shoulder height, with me in balance)..