What you're working on is a good way to get your feet wet. I think we all started out the same way
As I stated before, a 'wet cell' design isn't going to do much. The .5LPM you're getting is mostly steam rather than hydroxy. It's taking more energy to produce the HHO than is being delivered. As you progress in your experimentation, you'll eventually realize this & build a 'drycell' reactor. Mine puts out 2+LPM drawing only 22 amps, and there is no steam, just gas.
Keep on plugging & don't get discouraged. We've all been there..........