Spincast used to be all I used when I fished primarily with a bobber. I've experienced what your talking about. I think the line gets wrapped around it's self as spool of the less expensive spincast reels don't oscillate like on a spining reel. Even the ones that do oscillate the height of the spool is much shorter than the spool of a spinning reel. Bothe the Zebco ZO reels and the Diawa Goldcst reels have oscillation for the spool, not sure what others do.
Options are somewhat limited on spincast reels compared with the wide variety of spinning reels. I tried the higher priced Zebco Zo2 reels both the black and silver. They don't work very well if using a bobber stop that gets into the reel. After the Zebco's tried the Diawa Goldcast, still have a couple of the GC 80 and GC 100, that I use for bobber fishing in the summer or as guest rods on the boat. I like that the opening for the line is much larger on the Goldcast than on the Diawa.