I have to admit that I don’t know your trails at all, but here’s my 2 cents. I live on the Front Range in Colorado Springs, and our trails are more loose and gravelly than hard pack. I have tried a few combinations, but the one I love is a Specialized Purgatory 2.20 up front and a Specialized Captain 2.20 on the rear. The Purgatory is awesome for holding it’s grip when cornering, even in loose conditions, and the Captain gives you amazing traction, even in the snow, and has less rolling resistance than anything else I’ve tried. We have literally tons of decomposing granite all over our trails down here and this combo really works well. Good luck with your search!