Estimating and compensing what is good and bad for draft

Hii guys
What would you think about listing what helps or slows the draft?

I mean that, when you have a negative factor, then you can use the other ones to increase the chances to get a good draft.
We know the average rules and what we can do, such as the proportions, the possible length of the bench, how to mind the wind, the change according to temperatures...

I would like to know how we can estimate and balance the different factors.
As an example, I will tell what I personally have in mind.

I have 2 negative factors (at least!):
- I live at the foot of a cliff. The regular wind comes facing the house. Sometimes the wind comes from above.
And no way to have the pipes above the roof there!!
- The RMH is supposed to work better when it is cold outside. My climate is not negative (not at all!) but I will never have a lot of temperature difference between inside and outside. I am well above freezing point!

So what points should I watch better, in order to compensate the weaknesses?