I so far like a medium to short stroke for color packing. I have used both the Neo tat and the treasure chest at medium stroke with great results for color packing or blending. I think I may be more confident for solid color with a rotary than a coil now. I found that the long stroke slows the machine down and needs more volts.

As for the question about pushing harder, I thought of a good concept. I like to think if it like using a pencil. It's not so much pushing harder as it is tip pressure. Like when using a pencil, if you want a darker line you apply just a slight amount of pressure to the tip as you write/draw for a darker line. I find that almost the exact concept holds true for lining with a rotary.