Ok... looks like you skipped the misting stage (3+ weeks prior to filling) and went right to filling. No worries, this should still work out.
Your components (soil, laterite, eco complete, sat+ led and now compressed co2) make for a nice high tech tank. Though the sat+ is a great light (I have one on my 40b planted tank) it is best in tanks 16" high or shorter. You may find the need to add more lighting in the near future.
As for your specific question, short of using a drop checker, I would aim for 2-3bps and evaluate growth after a few weeks. Please update your thread when everything is up and running. I am interested in knowing how your regulator works out.