When I was using the iclear 30 with my mvp I actually enjoyed it for what it is, around 7-8 watts I think. It's not a bad tank, and the coils last forever. I used the same one for over a month, never have replaced it, but it collects dust now.
For the tip, I kept the plastic cover it came with, and trimmed the top, using it as a sleeve. My issue was that the tip constantly hit my teeth when driving. If you still have the cover, you could try that, otherwise a new tank is necessary, since I think it's a proprietary design, being threaded on. Standard tips won't fit. Correct me if I'm wrong, too lazy to get up and actually try it, lol.