I use the 6lb Invisx on my light spinning setup, I love it. It's a bit more convenient than braid to fluoro and worlds better than mono or co-poly, can't stand that stuff. If line is flying off the reel when you open the bail it seems like it'd either be from being too full or on the reel too loose. It happens sometimes to me because the line goes on the reel without much tension when fishing the light stuff. Every once in a while I'll cast out and hold the line while winding it in to keep it tight.