Harvest or wait?

If your trichomes are at those ratio's Waiting longer will produce more amber trichomes which means your potency is beginning to degrade. Chop i say. And if you didn't flush for 2 weeks prior, then you got yourself a nice batch of edible material, or a batch of really crappy smoke.

Give it another 5-10 days.

okay, then adjust your feed next time. react to symptoms as they start.. be patient, but don't let them escalate like this. you'll definitely want a different feeding strategy next time. trial and error. you'll get there. Even less-than-optimal grows can still give you good weed. That's mostly the genetics.

I defoliate the fan leaves because were completely yellow/brown

no fan leaves really hurt you here. you mostly have small fan leaves that never grew out much and some sugar leaves. sugar leaves are not as effective with photosynthesis, more so for flower, and 1000x less effective in stems. Without photosynthesis humming efficiently, ripening wil be slow. Any damage to canopy is that much more of a bigger factor. you wont haevevsuch a high leaf to bud ratio either.. your plant may have sacrificed soem bud production just to eke out a few leaves after you heavily defoliated it. have a reason to remove a leaf. don't do it without a good reason. take it now.. wait a few more days.. probably isn't going to make much of a difference. You still ahev some green leaves remaining, so you can try... make sure it doesn't die on the stem. 10% amber is an early window harvest. That's fine. But should be all over, not just the top cola. You could take the top off and let the lower stuff ripen more.. if still ripening much per day.