Mine was originally setup just as yours, minus the 4" legs on the basket. I remeoved the risers like some have said and went with just 2 caps, 1 ball valve and have NO problem getting up to just about any temp I want.
I use a weed burner now to light my basket. I try to focus my flame on the center and when they turn white I add some more wood close the lid and i am usually up to temp in less than 30 mins. This Sunday I was cooking 20 mins after starting the basket. I just waited until all the white smoke burned off.
Hope this helps.