Invest in a dial indicator and mount it to your miter gauge. You'll be amazed at how much better your saw aligns with the dial indicator. A blade that is out of alignment less than .010" will burn wood. Seeing .010" on a combination square rule is very hard to do.
I also agree that you are using the wrong blade. Use a dedicated 24 tooth rip blade. Probably a thin kerf would work best for your 1-3/4 Hp saw.