My guess is that the drop tables on some of these spiders were pulled from Magelo. The problem with Magelo, is that spider silk is (on live) on a drop table that's had like 30-40 other things added to it over the years. Ergo, the live drop rates on spider silk are not a good thing to go on imo.
You'd probably be better sourcing a bunch of classic quotes on the drop rate on specific mobs in specific zones. Difficult, a pita, but likely the only way to get it changed.
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First - Monsters & Memories
Argenti | Cobblestone | Animan
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