I have a jbj style bubble counter that has mineral oil in it and at most is half way full. No matter what, it seems oil travels up into air line and accumulates in the sway which acts like a drip loop. I keep changing the line which is a pain, and I'm running out of tubing. I set it to a reasonable rate, and the bubbles pop and never reach the top. I don't know how it's traveling straight up. Any advice. Also. For some reason that didn't happen before. When I set valve to higher flow. Instead of consistent bubbles, I get a hesitation and then a big glug, and this repeats. Any ideas about that.