While installing my system I've run into some issues.
1. I redid teflon tape like 3 times already but can't seem to completely eliminate drip. I put 6-7 wraps of pink Teflon.
The thickness of the pink tape likely only needs 3 to 5 wraps. 6 or 7 is good for the think white stuff.
Another thing to check is your fittings themselves. Most are cast pieces, and the cast has two parts. I've seen several fittings where the two halves of the case didn't line up quite right and the threads were not lined up good enough between the two parts.
Finally, the thing I have found that helps prevent leaks to to "pre-seat" the teflon tape. Basically, the ides is to get the tape to begin conforming to the shape of the threads before you connect the pieces together. All it takes is to place the tape in place, then screw on an imaginary fitting made of your fist (perhaps wrapped in a wipe cloth, or even your shirt). I find that I've had much better luck at keeping threaded connections for leaking when I pre-seat the teflon tape rather than relying ONLY on the two fittings to push the tape into place.