Cloning of different strains more efficient?

I have a bunch of different strains going in a 70-site cloner. Although the white widow and northern lights have rooted in a week whereas the shark's breath and bubba kush are about a few days behind the aforementioned and the skunk haze is much much slower to root (taking the full two weeks).

Is this common amongst the different strains? Is there any particular reason to this or a way to speed up the skunk haze and other strains? Perhaps the white widow and northern lights appreciate the 1200+ ppm 6.8pH more than the other strains?

Using 70-site power cloner and clonex cloner solution with a humid cap and flourescent light.

We are having problems cloning the Northernlights with no problems with papaya,Hawiian,sage and orangebud.

The NL will not root for us when there is no moon. Does best during a full moon and so do the others.

There maybe little tweaks you could do but then it would slow down the rest.

along these lines: I have 2 different white widows taken from 2 different mothers. The first I called White Widow Rootmaster, developed roots and started growing in 3 days. The second is 1/3 the size hardly no root development and in general is just a pain in the ass to keep up with the others. I think next time I will just stick with one series and not try and mix up different strains.