JCviper, I have the same sled as you and over the years I have been upgrading the factory suspension and carbides to enable better handling on the trail. I don't know much about the model of CA skis you bought so I won't comment there. I started by setting the recoil spring setting based on my weight. The recoil spring is the first adjustment to make and can easily adjusted in the garage or on the trail using the tool kit supplied by Yamaha.
1. Place a piece of masking tape of the back bumper handle and mark a horizontal line on it
2. Lift the machine using the rear bumper/handle a couple of time to fully extend the suspension
3. Using a tape measure, measure the distance from the floor to the line on the piece of tape you added and record the measurement
4. With a full tank of gas sit on the machine with your riding gear and have a friend make the same measurement.
5. You are looking for 2.0- 3.0" of dip maximum.
6. If it is greater/less than then you need to adjust the recoil cam to increase or decrease the tension on the recoil spring.
6a Only adjust the cam one position at a time and perform on both cams - and rotate is a increasing way. Don't go from say the lowest the highest, rather go from lowest to next level of height to the next level of height. I am 250 lbs and I have mine set to the thickest setting.
7. Next raise the front end of the sled and as suggested remove all of the pressure on the coils, the -retighten until snug.
8. I would start with three full rotations on the spring collars as a starting point and ride.
9 Regarding the center spring and strap I have not adjusted mine ever, only as a point of reference.
10. I don't think I saw what shocks you have on the front of the sled. I updated to the Elka Stage 3 shocks and have never looked back. No more tipping, no more ski lift, and the ability to change the damper on the trail via the clickers is amazing. Friends don't let friends ride those poor cheap shocks many sleds come with.
11. Lastly I run 6.0" and 4.5" Stud Boy shaper bars on the sled. The 4.5" is on the outside of the skis.
12. Once you get the machine to a good know point then change the skis to test steering and performance. This way you are testing the just the skis and can make determination the CA skis require more pressure to turn.
Good luck