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You need to read the manuals and then do some testing. I hesitate to give you the below cause it is all in the book. People who do not read the book often have a lot more problems. But, ...
If you have studs, you have to match up the carbides with the number of studs. If you have old carbides that are not sharp, they need to be replaced, if you expect to turn on icy trails. Given that you have matched and sharp carbides, ...
Loosen ski springs such that the A-Arms are nearly parallel to the ground. Make sure you have equal pressure on the springs. You can use two scales (one under each Ski) and a 4"x4" under the track to get the same ski pressures, if you are a perfectionist. Otherwise, just count the turns of the nut to make them equal.
Depending on how much you weigh(Sag 45mm), you need to set the spring on the rear suspension's rear shock. The more you weigh the more pre-load on the spring. If you later find that you are bottoming, then you need more spring pressure. Do not overdo this setting.
Let the straps out fully, Then set rear suspension's front spring support washer so you have just enough tension on the support washer to keep it firmly in place.
Then test the sled. If it wheelies, then extend the control rods. If the rods are fully extended per the manual and it still wheelies, then shorten the straps. Once you have the control rods set, so that it no longer wheelies, then try some turns. If it pushes through the turns, tighten straps until you have the carbides digging in good enough to make the turn. Do not over do it.
Then once you all of the above right go back to the rear suspension's front spring. Adjust it so that you have just enough tension on it to keep the support washer in place.
From this starting place, if you need more ski pressure, then shorten straps. If you need less ski pressure, then lengthen straps. Whenever you do this, check that support washer to make sure the spring is firmly held in place but not overly compressed.
If you find that you have the straps out all the way, and there is still to much ski pressure, then you tighten up on the rear suspension's front spring to take up some of the weight off the skis.
