As Nobody writes, it's not too late.
Personally, I prefer mostly amber trichomes, since I smoke to get stoned.. People telling you "20 - 30% amber" have heard it from someone else, who's heard it from someone else, and so on. They've never actually done any experimentation to see what they like themselves.
- If you like an "energic" high, you'll want mostly milky trichomes. But I highly recommend trying different percentages to see what you like the most yourself. It's also dependent on what strain you grow as well, as some strains give a more stoned high with less amber, while other strains require more amber for the stoner.
There's a lot of variables to try out, so don't just listen to someone telling you what's best.. Again, as Nobody writes, as long as it's not dead or rotting, it's not too late. ^_^