To drop a kindred seal the mob has to be at least level 51.
With regaurd to demonic tilpha palceholders, only about half of them are high enough level to give xp to a 75 (and therefore be able to drop a seal). You're probably better off killing something else at 75 to get seals.
The way i've done it (and this won't work for the OP) is to switch to bst and goto Attowha Chasim, charm a DC antlion and use it to maul the 'barely' EP scorps. One antlion easily takes out all the scorps then I release it, run back to it's spawn point and start killing scorps again just as they respawn. At night I kill corses & citipati if he shows up.
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