I use 50lb slickshooter and get tangles sometimes. I think it is just something that will happen every once in a while.
You really need to pay attention to how you are placing the line in the basket. I usually use a 2 handed retrive and I make sure to strip the line into opposite sides of the basket on each strip. I actually physically hit the sides of my basket on each strip with each hand as it helps me remeber to pay attention to how I am placing the line in the basket and this seems to eliminate most of the tangle problems.