Low 18's Mile

Hey guys im looking for a drag build for a Nissan R390 to get into the low 18’s…im getting it to 18.97 but can get no lower…Can anyone help?

The best ive gotten mine to hit 18.900 and that about invent seen any in the 18.8s or lower

I have hit 18.917 at my fastest speed. Today raced someone just as fast and faster so it may be possible for a 18.883-18.899.