They both work. Your problem must be 'operator error'.
As for the videos, after watching the first one, I said, "that dude must leave a lot of 9 pins." Then I watched the second video and sure enough you left a 9 pin.
You've got a good look to you. Looks like you get out of the ball cleanly and maintain good balance at the line. Without being able to watch several shots consecutively I couldn't comment on much else like targeting and consistency of your release. What do you average?
Nevertheless, what I see here looks pretty good.
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NutIf horse racing is the sport of kings, then surely bowling is a very good sport as well.