hotshot - I have the UI and AI and use them as you intend. Fresh oil, a little heavier, use UI. As the oil carries down, or on less oil, use the AI. Like them both very much. UI will soak up oil like a sponge. I clean both with a 1/3 Simple Green, 1/3 Alcohol, 1/3 H2O mixture. Plus I bled the UI in the oven once and throw it out in the sun when it is hot enough. After the oven bleed, it responded like a brand new ball. Haven't bled the AI yet, though I did throw it outside once (didn't get a drop of oil out). Good luck!!
