Go back and cut those straight 8"-10" trees. They are easy to haul out and split.
My favorite size of osage tree to cut is 20"-24" as long as they are straight and clean. They are tough to drag out but once I get them to my splitting stand they are easy to move around and work on. I can get a lot of belly splits from trees that big. It's nice to pop off a belly split, seal it, and put it away to season. No sapwood to deal with.