Bearcat after looking at your secondary you have the classic low pressure in over drive. The torsion system is bad for this and hard to find the sweet spot. It can be done.
Here is the deal and I guess I am sounding like a broken record on this. When you take a rubber band and stretch it the band thins. This happens to the belts in all CVT clutches. Softer belts more than harder belts. Now the DDrive is totally different than the chain case by putting much more load to the clutch. This is why the larger diameter helix in these systems. Ok ever one who trys to pull more over drive gets these black marks down about 5"s diameter in the secondary. The belt looses its grip down here because of the low belt surface area and major feed back from the drive system. The torque rises at this point that the spring and helix are trying to pinch more and the
belt is thinning. This thinning then needs less off set or the fixed sheaves pushed closer together to keep the belt pinched. Once you do this you will hold the belt there and mph more.
IF you look close you will see where the belt is slipping at the top of the secondary by nice polishing then the black mark at about 5"s diameter. This shows how narrow the shift torque is. The 036 is really the best belt for these sleds if your not going to mess with a different off set. The 036 will not thin as much under load but is hard. This hard belt will not sick as much load to the sheave and will not thin as much because the torque will not over load this belt. The narrow torque shift fits this belt perfect.
Ok so now we have the different compound belts and they tend to stick more. On my M6 with the 10" secondary I run the polairs IQ race belt 1104. It put so much load to the clutches I had to move the secondary in as far as I could but then wanted more over drive. I then cut .060 off the back side of the secondary to move it in even more. This let me pinch the belt between the two clutches by moving the two fixed sheaves closer. If I didn't do this the 1104 would thin at high torque and slip then blow the belt in seconds at 120km+. The heat from the belt slip would vault so fast most can't tell that it is the off set doing this.
Now back to the 10" to 10.4" with out changing the center to center the belt is longer to run it. The belt is longer like a longer rubber band and gets a bigger contact patch in the clutches at 1-1. This extra torque feed back to the longer belt (more surface contact) makes it thin more than the shorter belt (less surface contact) that thinning tends to slip more and the longer belt needs the fixed sheaves closer together. This is why the different off set bars.
The off set bar is just a guide for the average bear. If you spin the sled up to or more than 85mph you are pulling into this bad range (stock offset bar) for the belt to start thinning and loosing grip at that 5" diameter in the secondary. If your happy with 1-1 than there is no need to change but to widen your shift ratio you have to move the secondary into the motor more closing up the space between the two fixed sheaves in the clutch system.
036 needs more off set than the 044 meaning the 044 needs the secondary moved in more.
046 needs more off set than the 060 meaning the 060 needs the secondary moved in more.
All this means is the 036 will slip more then the 044. The extra stick of the 044 belt lets it thin more under high torque. Same between the 046 and 060.
Trust me on this. Keep moving the secondary in .030 at a time till it stops MPH more. Then go back one shim.
As the belt breaks in you have to move the secondary in. I MEAN YOU HAVE TO MOVE THE SECONDARY IN FOR THE FACT THE BELT IS NOW THINNER. YOU WILL BLOW THE BELT WITH A THINNER BELT THAT STICKS BETTER IN ONLY 100-500KM'S ON THE BELT if your pulling more than the average guy in clutch shift. The belts are (going off the top of my head correct me if i am wrong) 30 degrees totally new. The sheaves in the clutches are 28 degrees so the belt will thin 2 degrees as it breaks in.
Real world torque feed back is totally different than the computer is telling cat. BUT cat is not trying to pull more over drive like most of us tuners tend to with mods and clutch work.
So in short I am telling you that if you see these black marks down in at 5" diameters or your blowing belts keep moving the secondary in .030 at a time till the heat is gone. Heck I have added windage plates to my secondary just to add heat now to my secondary.
NOTE: picture and the same black marks at 5"s cupped out in the sheaves. Full shift attained on 8.5" primary and 036 with out cutting the back of 10". NO shims behind the secondary running right on the bearing.
Don.