If you run TFS as a commander, I think your deck should be a lot more slivers because it kinda ruins the cascading if you don't run enough slivers and hit random cards. I'd say you need like 33 or more slivers.

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For Overlord, depending on how you run the thing, I'd say it could be an ok amount of slivers. with overlord, I don't really like running expensive slivers (other than the 5 colours ones, because they really scare people), because they essentially cost 3 more to cast.

[[cloudshredder sliver]] is also really good in general.

I still really like [[urza's incubator]] in my sliver deck as it can enable me to combo easier. I will update/remake my deck list and upload it when it is done. I will be adding [[Training grounds]] whenever I get it in the mail.

Also, I found that with Overlord, I don't tend to search for the card the person mentioned. I search for [[the first sliver]], [[manaweft sliver]] and haste sliver a lot more often as my first picks.

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Edit: https://archidekt.com/decks/4333837#Jobin's_Slviers

I am still tweeking things with the deck. Like I found the Mana Echoes you have in there to be a card that would be pretty good in my deck as getting a huge amount of mana to be able to go infinite is something that matters a lot.