I'd first open up both your top vents, the single one looks pretty small. ok if 2", but smaller is not great.
Your intake vents *look* quite a bit smaller than 3/4". If so, You need bigger inlets. 3 x 3/4" are pretty standard. I generally start with two full open and cut down from there.
If you can take your lid off and you hear some cracking as the fire gets going, it's probably the things above that will make it work with the lid on.