My current setup consists of a disposable welder bottle and regulator from Machine Mart, AE needle valve, check valve and a Fluval 88g diffuser. I am wanting to increase the bubble rate, but I can't seem to get any higher than 2 bps. If I release the pressure in the line, I can increase it temporarily, shortly slowing to 2 bps again. Is this because of the small size of the diffuser plate?