Mine is pretty stubborn about letting go of the cartridges too. The best answer I can say is DON'T FORCE IT!
For mine, after turning the lever to unlock, I push the whole cartridge to the left slightly, then pull on the right (side with the lever)
If it doesn't let go, try turning the lever to lock it, then unlock it and try again.
I honestly don't know how I get it to release the cartridges, but it's never let one go on my first try, and it's always (eventually) let them go without forcing anything.
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