Agree that tires are definitely an easy place to save weight. There are definitely lighter options than the Forekasters that will likely work well. Which tires exactly will depend a bit on where you ride. The XC Tire Thread has some good discussion on that. I also agree it’s worth looking at droppers. The Fox Transfer and BikeYoke Divine are both light options, but $/g that won’t be as big a gain as tires. Those wheels are reasonably light, so probably not much to be gained there.