When I am shooting for score, I shoot Vogel SPORT in my 953. This is the cheaper of the Vogel line, also called their training pellet.
When I am just plinking or casual target shooting with the 953 (or any of my starter/trainer rifles), I use the less expensive Daisy or Crossman pellets that I picked up at Walmart and Pyramid. I just do a quick inspection of the pellet before I load, and if the pellet is distorted or damaged, I just put it aside. From my casual shooting, you can easily see the pellets that that will mess up at 10 meters. And since you are not into serious competition, you don't need to spend the $ for match grade pellets.
Since it sounds like you will be doing most of your shooting at 10 meters, I recommend you get a carton/tin of Daisy or Crossman wadcutter pellet, and shoot a few targets off a rest. Use both a front and rear rest, to eliminate your wobble. The rested position will be MANY MANY times steadier than you or me in the standing position, so it is good enough, you don't need a machine rest (which won't work for a SSP anyway). Put a scope on the rifle for this test, so you can aim more precisely. If you can keep a reasonably TIGHT group with that pellet, that is good enough.
Here is a hint: If you shoot groups, adjust the scope so the pellets hit BELOW where you are aiming.
The reason for this is, once you shoot out your aiming point, you are just guessing at your aim for the remainder of the shots. This method preserves your aiming point for all shots in the group.
After you shoot standing for a while, you may want that heavier 853 barrel weight.
About the butt pad. IF you also want a longer LoP, you might be in luck.
Remove the butt pad. Get a scrap piece of 2x2 lumber. Cut the 2x2 a few inches longer than the butt pad. Drill the 2x2 so you can screw it into the stock with it flush at the top. Screw the butt pad to the 2x2 at whatever height you want. You now have the LoP lenghtened by 1-1/2 inches (the finished dimension of a 2x2), and a lower butt pad. This may not be competition legal, but its CHEAP, and for casual use at home, who cares.
gud luk