Add a bit of shampoo to your wash water, then rinse using white vinegar.
When prepping and spinning fiber in the grease, you want your fiber to be warm enough that the lanolin is soft so the fibers will slip.
There is a big difference when spinning a soft, short stapled roving and a long luster roving.
With a 4"-5" staple, you will want your drafting hands about 6" apart! Same goes when prepping from comb through a diz.
Also remember that the longer staple does not need as much twist in the yarn as the shorter stapled fiber. A long staple fiber such as mohair with high twist will turn the fiber into rope.