Thicker is better (higher "R" value). 15 CFM should do it if you have confidence in the freezer. The dual will allow you to adjust two different PSIGs.
The two line combinations are based on system balancing such that you utilize two distinct pressures in a system against each other. This was based on an estimate that you would be using 14 PSIG at the keg. The combination of lines has approx. 14 PSI against the beer as it passes through it along with 2 PSI of gravity.
Pitting the 14 PSIG against the 16 PSI is not an exact balance such that your flow will be slower than a gallon a minute. If they did match, you would have very close to a gallon per min. flow speed. If the flow rate is two slow, cut a few inches off of the 3/16" until flow speed is desirable. This procedure is performed often by beer techs with retailers' systems.
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