Tablet weave warp count

I've tried a couple of tablet weave set-ups with designs on the Loomy-Bin Design program.   I was curious about how many warp threads I had and how narrow the woven band ended up.   Had 10 cards, which meant 40 threads.   It was not nearly as wide as a 39 warp thread inkle band.   I assume it had to do with there always being two threads on top and two on the bottom for every weft pass.  

I also struggled with keeping up the proper sequence of which cards and which directions they were being rotated.   I love the designs that are possible, but get frustrated having to un-weave.