This is a problem with many extractors (even pricier ones) that have larger spacings between the basket wires if the frame is extracted tangentially which I'd say all 2 frame extractors are. I agree the cake racks are a nice cost effective fix, the other option is to spin slower if your arm can take it! You may also find the comb pushes through the cage which can get messy when removing frames to rotate them.
There appears to be a recent increase in preference towards radial extractors which don't have the same issue (that and they are cheaper to produce than swinging basket tangential).
I will take this opportunity to make a tenuous link back to Warre here, who actually used cages around his combs before putting them into the extractor to support the comb (as he used a top bar frame design with no wire etc. for support)