The objective is to have the nib pointing at the angle of the slope line, with the hand and arm in a comfortable position and with the tines opening evenly when pressure is applied.
I turn the paper anti-clockwise until the slope lines are pointing directly down the page. This isn't too extreme an angle, and it doesn't take long to accustom oneself to writing 'uphill' like this.
If fact, I use this technique for all my writing, regardless of style; turning the page counterclockwise so that the slope lines are always at right angles to the edge of my desk.
For example, for Italic at a 5 degree slope, the paper is turned very slightly whereas, with Gothic which is an upright script, the paper isn't turned at all.
In this way, my nib is always held in the same position on the paper, regardless of style, with the paper turned to accommodate the various slope angles. I believe that this produces greater consistency to writing, in general.

