I had to do a temporary move and instead of buying another big safe just to bring a few guns, I got the cheap, made in China, Securit Tactical cabinets (no other options).

I bough this thick insulation liner from Home Depot (I believe it was in the A/C section) and glued it to the back and sides of my cabinets covering all the open holes and rack slots:
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Added 2 Golden Rods:
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Ran the wires (including led light wires) by enlarging the existing holes and covering all holes that don't have wires going through them:
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and now I'm at 22%
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Pretty warm in there too. That won't affect anything being stored inside?

That will crack your wood

I don't own guns with wood.  All ARs/AKs/SCARs  Even my AK furniture is all plastic.

Not at 92 degrees.  Its not like its 150 degrees.  
Just a nice summer day in there

Doesn't say much, it had to start off with dry ambient air to get there.

I don't get what you're trying to say..
It's 20% lower than it was before