This has become a very popular question over the past few seasons with progressive riders always trying to find a way to make their new gear perform its best. The rebirth of the freestyle movement about two decades ago brought on twin tips, which for the pure park skier may have included a few different mounting positions marked on the topsheet of the ski.
For the pure freestyle rider, moving up the mounting position makes plenty of sense to allow for easy switch skiing, effortless switch landings and to lower the swingweight of the ski.
When it comes to mounting position on Powder Skis the only position they should be mounted is on the mark put on the ski by the manufacturer. By mounting the bindings in any other position, you drastically alter your positioning in relationship to the sidecut and the rocker profile of the ski, causing them to act differently than how the engineers and designers of the ski intended.
We often get asked if skiers should be following this trend with their powder skis. By mounting the bindings a little more forward, you will start to sacrifice flotation by moving closer to the rockered tips. If you purchased a nice fat powder board, why would you start to compromise the flotation in all of the conditions that we dream about having this style of ski for? Furthermore, if you move the bindings a little forward, this moves you past the intended sidecut of the ski. While you may be able to initiate a turn slightly quicker on the groomer, this will feel a bit weird and too quick into a turn when you are surfing deep powder.
On the flip side, moving the mounting position back makes the ski much more difficult to turn when you want it to. A problem no one wants to have when they are riding through some deep pillow lines in the trees.
In summary, that line on the skis that tells you where to mount the bindings on your new powder skis is the correct position, regardless of what you have read in some online forum or where your buddy thinks you should mount them. Any change to that will affect how your ski performs and behaves in powder.