- Use box speed, there is no reason to change that if you follow through.
- Meter without the sky. [You are most of the way there at this point.]
Use _REAL_ box speed. (Attention if you are using other manufacturer films other than Ilford, Fuji or Kodak)
I would maybe add: increase exposure by one stop (when using negative film) - but I guess metering without sky does the job, mostly.
Develop by manufacturer instructions and times only.