I use the Forsters Bonanza Lube on an Ink Pad ..... never had a stuck case with this yet.
As for your broken pin, you may have a Berdan primed case/s mixed with your .223 brass ( unless the pin was broken in your attempt to remove the stuck case)..... Berdan Primed Brass = Number 1 cause of broken decapping pins..... Good news is the pins are cheap and any Gun Store should have some in stock.
Check all your brass if it's head stamped 5.56 and/or it has a heavy crimp around the primer chances are it's Berdan Primed Military Brass.
Get a good torch or bore light and have a look down the case mouth if it's berdan primed it will have two flash holes, discard these into your Brass scrap bin.
Cheers
Pete
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