After cutting slabs from chunks, tabs, nodules or small boulders, I use a tile cutter (supped up glass cutter) to cut the slabs to sizes and shapes that I want to flake. It works fast and very easy. There is no need to run the slabs back through the saw unless they are really thick. I cut slabs up to 3/8 inch thick this way frequently. You can get the tile cutter from the internet, Lowe's, Home Depot or most tile stores for about $20.00.
WA