re: This Arkansas spread has me worried. It is not moving like it should

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The spread moves during the week to ensure even money on both sides. The only thing Vegas/bookies want is to make money on the 10% juice from the losers.

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This not categorical. This is a huge misconception. The scenario you are describing would actually result in Vegas never getting paid. If they have equal money on both sides and it hits on the number they do not get paid. There are plenty of times when the action is one sided and Vegas does not move the line. Their goal is to maximize value, not to guarantee equal action on both sides.

Movement of a line also depends largely on the number. For example, is much easier to move a line from 5-6.5 than it is to move a line off 3, i.e., it takes way more action.