I assembled the roommates new build 2 weeks ago with a 12600K. Noticed the same predicament. I put a normal pea sized dot dead center, then two smaller ones closer to the sides. Wanted to know if my guesstimate was close, so I removed the cooler and checked coverage. Was almost flawless. Could've used just a hair more at the sides for immaculate coverage.
Reapplied new paste then later hit it with Prime95 and it's holding up great.