I would just continue to give the same amount of nutes as they indicate for 8w... no harm there at all.
I agree your buds could be fatter but maybe the strain doesn't produce really fat buds? If this is a sativa dominant strain, they're just not going to get really fat the way an indica can/does. From the pistils I'm seeing, you've got TONS of orange ones which means I would be looking really hard at the trichomes to see what color THEY are. If you have a microscope or a loupe, take a look to see how many have turned amber - you want to shoot for about 30%. If you don't have a microscope or loupe, zoom in as close as you can with your phone and take a picture... then zoom the PICTURE in and you'll at least have a decent shot at seeing what's happening with the trichs... I personally think you're really close and wonder why YOU feel they look too early to harvest!
Good luck