John,
I would shut the main drain off or at least almost off... This will make your skimmers work a little better. Turn the handle of the main drain valve so that it point to the skimmers valve.. This will shut off the main drain, which is just not needed..
I would also find which of the two skimmers is the closest to the pad.. I'd then adjust the skimmer valve so that the far skimmer has about the same suction as the near skimmer.. To do that, take the skimmer baskets out and just use your hand to feel how much suction each skimmer has..
The near skimmer will almost always have much more suction that the far skimmer... I like to try to adjust them so they are about the same, but in the big picture, it is not a major issue, one way or the other.
Thanks,
Jim R.