I understand why you are a bit timid with your CO2. It's your Red Sea needle valve. An inexpensive mod is to run a better quality needle valve inline. A good one is the Fabco NV-55 with barb fittings. You open the stock needle valve wide open and use the Fabco for control.
http://www.aquabotanicstore.com/Fabco_inline_needle_valve_p/nv55.htm
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You could also use a Swagelok/Nupro/Parker metering valve or an Ideal needle valve. You can get these with an optional micrometer handle for fine tuning.
I should be getting a few of those NV-55s next week and have the standard clippard hose barbs (with the single barb) to go along with it. Aprox price should be about 4 dollars less than that site.
Left C, that EI Light article is great.