If you think about it, where the blade is in relation to the crown of the tire affects the angle of the blade to the wood.
When I put a new blade on my saw I take a hunk of plywood and slice off a quarter inch strip. If the cut angles to the right I adjust the tracking one way. Cut another slice. If it cuts less to the right, adjust the tracking a little more in that direction. If it cuts more to the left, I adjust it the other way. I repeat, adjusting the tracking appropriately until I get consistent straight cuts. Yes, I try to imagine how moving the blade to the left or right of the crown changes the angle of the cut, but it's easier to look at the result and adjust accordingly. This let's me dial in the cut so the saw cuts straight every time until I change the blade. The whole process takes less than 10 minutes.
Cliff
The problem with the world is that intelligent people are full of doubts, while the stupid ones are full of confidence.
Charles Bukowski