I would first turn your CO2 up a bit, and make sure you are properly circulating in the tank. I've seen a few discharges that are right at the top level of the tank. My y-locks point almost straight down, and a Hydor pushes a current along the bottom. Stay with the needle wheel chop method. It is pretty effective despite the seltzer water look. Get your plants up and running and then work on other less seltzer methods.
Remember, the water that is offgassing CO2 has left the tank. Focus on gassing up the water going into the tank.
Play around with your set up at each step of the way. See what works. don't skimp on the CO2, and don't just rely on the drop checker. Your plants will tell you that you're doing good. The drop checker is just one tool in the tool box.
You can see in the picture the CO2 line(green) just after the pump. Water goes through a UV light (small black tube on the wall) and enters my monster reactor (3" PVC- oh yeah).
You can barely see the ball valve on the return from the reactor. I have it throttled down just a little bit. I watched how many bubbles were spitting out as my measure; only after the CO2 has been on for a while in the morming. As CO2 builds through the day in the reactor, bubbles spit out in the evening regardless.
Hope this helps
OH YEAH- ITS 30 KINGS!!! (WTF????) =)