Anyone give me some advice, so the lower branches ...

erm its your plant buddy your rules my advice like other growers have said look at trichomes first and if they are to your liking then I would consider cropping her but keep in mind cannabis plants by nature will grow most in the final weeks of flower this is in order to make the buds as large as possible in order to better catch male pollen and reproduce :) upto you but id give it a week or so yet :) best of luck your flowering window is quite large ive seen some growers that flower plants for over 12 weeks and get some very impressive results :) upto you buddy its strain dependant and each one is different but they are similar in my experience anyway :)

Those pistols coming through on the main are either from light stress or she's just telling you she is done. If the bottom half is rady the main tops will be.

I'd wager even so, you ahve a few more days left.. usually pistils are coiled up and 'dead' (coloration indicates they don't or won't function for pollen reception soon) by the time i see 5-10% amber.

In this particular case, i'd wager that is new growth in the areas of the plant that were receiving slgihtly too intense of light -- possibly took weeks for it to amount to anything.. or could just be near end and a last ditch effor to get knocked up with fresh, functional pistils. I don't wait for a superficial layer of new growth to ripen if it's too far off from the bulk of the plant. Each to their own... a week or two extra for a handful of grams isn't my cup of tea. Scope the other growth when assess, can trim off any nonsense and use for extracts.

Plants don't finish uniformly. Use the trichomes as your guide. You can harvest your plant in stages. It doesn't have to be all at once. Your lower stuff looks ready so chop it if you want. It won't affect the upper plant. Might even induce a stress response and produce more resin on top.