8 for me.... You might want to also know if people are running a low nutrient system; becouse many times these systems run with a lower dkh. Zeovit is one example which wants you to run your dkh in the lower range of 7. This might be helpful to know.
Would be super helpful for people to post why they are keeping it at that level. Alot of new people don't know why and theres a huge difference in peoples DKH.