Think of it this way; you fill a chimney with charcoal and light it from the bottom with newspaper or whatever. It starts smoldering slowly from the bottom up, but it isn't burning fast enough to suit you. To speed things up, you squirt some charcoal lighter fluid on the coals on top, but it doesn't light as you expected it would. So, you take your lighter and put flame to the top of the chimney, expecting it to singe the hair on your arm when it bursts into flames. However, instead of bursting into flames, your lighter simply goes out. Not fiction, fact...that is what will happen. The smoldering coals are burning through the oxygen long before it reaches the top of the chimney. And, even though you are burning from the top down in a basket in your case, it doesn't take a lot of burning/smoldering charcoal to deplete the oxygen so that any wood you throw on top will only smolder just like the charcoal. Three quarters of a basket charcoal is a lot of charcoal. If you want to burn splits, just start with a half chimney of charcoal to get things going, then add splits as needed to maintain the temp you want.