Looks great HG! Some autos can go a long time before they throw out pistils, so once you get to 4.5 or 5g just hold on there.I actually added an Autoflower schedule to my MegaCrop Feeding Chart document this morning and coincidentally, it's kinda what MrS suggested with a little bit of Shed thrown in:
Then, once you see those pistils, increase by 1/2g/gal.