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What might I be missing in my reads in these situations?

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Reads are generally going to irrelevant in this spot online, unless you've got a fair sense of how many 8s he's limping utg with.

He's raising any 8 and often any ace if he's got that far with one and he's sometimes bluffing. He occasionally calls with an ace, has slowplayed KKK etc. and probably always calls with any 8.

If he's only limping 88, 87, 89 and a8 utg, then there doesn't seem much value in raising unless he's both got there and calls a river three bet shove with an ace. Personally, I generally wouldn't shove here on Stars because he doesn't both have and call with a worse hand anywhere near enough.