What do I do when I got mostly small pieces of coal (not Briquettes) to work with? I'm using a classic weber kettle and when I prep two hot chimney lighters full of it the one with larger pieces gets significantly hotter on the grill. Both are sufficiently ignited with mostly white ash over em. I'm also using coal baskets, pic related, to control the heat zones better. If I didn't use them I think a lot of coal would just dump straight into the ash catcher.
Currently it's struggling to even reach ~500f/250c

Do I just throw that shit out and buy proper big chunky coal or is there a way?