Mt slicks wear indicators

I'm having that issue now. The wear indicators are visible but flat. The last night out, 2 weeks ago, my 60 ft fell off, from 1.55s to 1.68s. I put it in the trailer after the second half pass. Running 29.5 x 9 on 11.60 car. For me, it's time to mini tub and upgrade to 12in it looks like!