If 30 was too much for your needle valve, either you need to not get an Atomic or do upgrade your needle valve, or just leave the tube in the canister intake. You'll need 35-40 minimum for an Atomic.
For needle valves, check Bettatail's metering valve thread. For a tight budget, I'd recommend one of the Pneumadynes, an SMC AS-1200 or -2200, or a Clippard MNV-3 or -4.
They're all $12 or less before shipping.