A lot of leaves going brown during flowering

So the question is - do I defoliate or let them drop by themselves?

Looks like you're light on potassium. whats your feed?

I've switched twice with this plant. It's a Jetfuel OG from Ripper.

I'm now using Remo Nutirents Bloom & Micro.

Any recommendations?

Whats your pH running? What type of medium are you growing in? We need more information. A potassium deficiency will really kill yields (seems to be doing that) and limits terpene production.

If you search google for "cannabis potassium deficiency" you will see pictures that look just like your leaves.

If the pH is too high then potassium isn't readily available for uptake. Something to consider as the nutrients you are using are pretty strong in potassium. I am not sure how much of each bottle you are using (mL per gallon) so if you are feeding weak PPM then that's the issue. What is your feed PPM?