I would keep putting more in, those inlets on the bottom don't do much for this style of fire. It gets its air from the top. Think of all the people that burn trash in drums, they have no intakes on the bottom. Plenty of people burn first, then put on intakes. Just be mindful of hot ash coming out of those intakes now, cap them off if you have any.
XL Big Green Egg, Weber Performer Platinum, WSM 22.5"