Less dust or top soil would better use a short pin. More soil or dust use a taller pin. Traction is usually derived from contact with the hardest layer under the soil. There are tracks that have an abundance of loam where you would use a step pin type tire. I have not delt with one in years. These tracks tend to go away from driving on them and they are hard to maintain. This is why you do not see them often.
I'm not too familiar with the GRP product but I have seen them.
The Jolly looks like a tight pattern square lug tire. It should be neutral in handeling. With the pins that close together it will be consistant but it will grab less than a wider spaced design where the pins flex more.
The Atomics look good for light dust or no dust stuff.
I do not know anything about the compounds compared to other brands. I do know their stuff looks like it is very well thought out. The new carcass is left rough to give more flex in a tighter pin configuration.
I feel the others will soon follow this method of carcass molding to increase the traction of their tires.
I always love a good idea.
TEX
<---- Not done yet!