I use a Weber lid too. The first grate is 1" below the lip, and the other is 6" below that. That places it at less than 24" from the fire....like 21" or so....but it still works well. I normally don't use the lower grate unless I need extra space or head-room.
If it ain't right, don't do it....If it ain't true, don't say it....If it ain't yours, don't take it.