Far from being unusual when feeding F/T to a spider or spider combo, this is also part of the wobble.
Not much you can do about it.
One thing I forgot earlier temperatures also affect the wobble, based on what I have seen Spider tend to do better at lower temperatures (88 max)
And of course as far as selective breeding sadly animal that show very little wobble can produce train wrecks and vice versa just like a young animal can go from severe to mild wobble and vice versa.
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