I choose the side where I will play short slice by seeing where my opponent is, I use short slice dtl a lot, so you needn't worry. If you've ever played tennis, you'd know that if you want to hit short slice, you'd have to hit it the same way you hit slice, just set your arm looser instead of tightening it. Anyone can do that. Well, I rarely see counters that have good serve and volleys, especially not playing serve and volley game, actually there are no such counters.
@Manu: If you change short slice while I had to position myself perfectly in order to play short or the shortest slice, then you can change counter's shitty lucky shots that occur quite often and in the middle of nowhere, that is impossible position. You said that counters get powerful shots by getting the power from our shots, but he is hitting my deep spin shot that is almost on the line with such power, deepness and by taking it too early, that is just impossible! And I know you saw such shots in the previous record.