I've never heard of spice degrading that quickly. I would bet it has more to do with the smoking tek than the spice. Even if 50% of it degraded into DMT N-Oxide you would still have a full blown experience with 100mgs.
Try the leaf bed method with that same spice @ 50mgs.
If that doesn't do it then your friend has the fastest degrading spice on the planet. I've had spice vial sitting out for 4 months without any noticable lack of potency. The best place to store it is in an amber vial in the freezer (or liquid nitrogen if you have access to it).
The Spice extends life
The Spice expands consciousness
The Spice is vital for space travel
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Never underestimate the power of STUFF!
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I don't know SWIM and personally don't trust him at all. If SWIM is posting, most likely I will not respond...as I said, I don't trust the guy. YOU I trust, but never SWIM.