Something you could try when you get your sprocket mounted up. Find a large perfectly flat surface to balance the wheel
on the spacer. Do this with the new wheel and the original. Measure from the surface to the edge of the sprocket and to the edge of the rotor and through the axle hole to the edge of the other spacer.
If they all measure out the same, it's your caliper pins or the wheel is setting crooked or something is up with your caliper bracket or there's some other thing causing the caliper to not cooperate. I don't suspect this because I'm sure you had the old wheel on with no problems.
If the assembled spacers measure the same, but the distance to the sprocket and rotor shows they're to the left, or if the spacers are measuring too wide and you were fighting to spread the swingarm to mount the wheel, then the spacers are wrong and it's never going to line up. Call a Talon
supplier for replacements. This is possible if you don't know the wheel's history.
If everything measures the same except the rotor; I doubt it would be, but if it's a lot different, then you might have a warped rotor or possibly the hub was machined wrong, if it's only a little different, probably the case, then there's still the possibility of a warped rotor or it's the same as my Eagle hub where it was made a little to the left and again you're dealing with the caliper or the wheel is setting crooked and that little bit of difference gets increased at the caliper or even a combination of all these. I'm thinking this is what you're dealing with, but I also think the spacers could be wrong.
To give you an idea on my Eagle hub, I had to slide my caliper all the way in till it wouldn't move any more and it was still tricky getting the wheel mounted up with how close the inside pad was. However, with the wheel mounted and squared up, it doesn't drag even with a new pad. There's just enough inside movement on the caliper to let it float over and self align a new pad. If there was any problem with the pin, it could get stuck.
I can see where the reason for this is possibly the manufacturer is trying to eliminate some of the leverage the caliper puts on the pins by making it ride as close as possible to the attachment point of the pin. This means tight tolerances though and if something is off a little, there could be the problem you have.