Spooling with a pencil is not a good idea for a spinning reel, I have never had it work out. Over the spool, under the spool, doesn't matter, all ended in twists for me. Spooling off the end that does not loop up has always worked fine. I spool dozens of spinning reels a year, everything from 2lb to 10lb and line twists have never been a problem.
The quality of the flouro, specifically the stiffness, is another thing to look at. Stiff fluoro will not work well on a spinning reel.