While you're probably breaking every manufacturer safety recommendation in the book, there are a couple of improvements you can make.
Something like a rectangular chunk of ply (should be 3/4" or so thick) can be clamped on the saw table to help you hold the piece being cut at 90 degrees.
A small (sacrificial) stick parallel to the fence can keep the workpiece from being dragged through the fence. If it's something like 3 or 4 inches wide, you can put it flat on the saw table and (since it looks like you have a slider) you won't have to cut through it every time. Plus, if you clamp it in place, the kerf will indicate the cut line and you'll be able to set up faster.