Once those types of fixing start to spin they are trouble!
Never rated them, Hollow walls are always a problem when trying to fix medium to heavy objects on to the wall.
I use what they call HALLOW WALL ANCHORS-CW SCREWS. They come in different types regarding the duty they will be used for. You simple drill the correct size hole that fixing desires then put the fixing in the hole, tighten the screw and the anchor will open behind the board and grip. Make sure you have done all your measuring so holes in correct place, because once they are in ,they are in! Make sure you tighten screw before you hang anything, so the fixing is firmly in place then you can take the screw out and the jobs a good one.
Good Luck hope this is helpful
did you drill a small pilot hole first?also these fixings come in different lengths.if you have dot and dab walls you need a shorter fixing than a stud wall.you might have reached blockwork behind your plasterboard causing it to spin and not go deeper.
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