As others have mentioned, with 3/4" thick wood, you need a thicker blade. I use #3 Olson Mach Speed, but many folks use a #5 blade. The thinner the blade, the more "flex" that occurs as you're making turns and that's what causes the issue you're having. Good luck, let us know how it goes.
If you're still having issues, don't drive yourself crazy checking and double checking if your blade is perpendicular to the table, try tilting it slightly to one side, test again, and if that doesn't work, tilt it the other direction and then test again. Keep testing until you find the "sweet spot"