I found the stake video again. Just operator error.
They make skip chain for Alaska/ripping mills but also for regular cross cutting. Your slabs cut pretty well I thought. Probably because it wasn't solid wood. You had a lot of edges and voids in there. Here is the best explanation I have found on skip chain advantage from an Arborist site:
"The primary advantage to semi or full skip is when cutting larger logs. The wood chips are carried out between the cutter teeth and having more room for those chips in a larger log allows the teeth to continue cutting until they exit the log and dump the chips.
When the gap between teeth fill up the tooth really can't do much more but vibrate and rattle. On smaller stuff regular chain will work better because the teeth exit and dump often enough not to need the extra spacing."
A couple other advantages are less teeth to sharpen on long bars and less drag when using a bar that is to long for the power of the saw. I had a guy I worked with who liked a Husky 359 with a 3/8 .058 gauge skip chain on a 24" bar. He thought it was lighter and handled better that a bigger saw with a full chain on a 24" bar. Now a days with the small kirf chains and better power to weight ratios there are more options.
gg
Yup that makes since to me, most of my firewood is on the small side 6-12"