'Subscription' mobi gets messed up if it is archived as a PD, and you need to delete from MYK before you can delete from your Kindle. It will work okay if it is side loaded (via USB or downloaded using kindle browser from instapaper theoretically).
If you use Windows, you can get the Amazon Send To Kindle app and use that to send a mobi downloaded from instapaper; it has an option to deliver wirelessly without archiving to PD. Wish they'd share the secret handshake that yields that behavior.
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