Gorilla Cookies Auto

Hi everyone. Really worried about my 2 bigger/older plants. They have absolutely 0 trichomes. Last time I did this strain, the trichome production was definitely starting at this point, so it's worrying. The leaves were yellowing majorly - this was probably due to not enough nitrogen in the beginning. But that has been fixed and yellowing has slowed. It could also be coupled with the fact the plant is reaching close to the finish line. Im just really upset about no trichomes as I've seen posts online of people who went through a full grow with fat buds that still had absolutely 0 trichomes (although different breeders/strains). I'm getting quite fed up of the inconsistency I keep getting with FastBuds seeds. It's becoming a serious waste of time. Same strains come out different, and now I have this problem. I understand there can be different phenotypes, but the inconsistency and differences are so large. Anybody else have this issue? Did trichome production manage to start? I feel like my buds are going to have little to no effect at all.