There have been some good suggestions so far so I wont deal with that stuff but i got a couple of questions about your arms.

When are you measuring them? Do you measure them cold, or right after you lift? How much caffiene have you been taking in recently?

The point is that if your muscles were jam packed full of glycogen the first time you measured, then they were severely starved the next time that could account for it. Also if you increased your caffiene (or other diuretic) intake unknowingly then your removing the water from your muscle cells, causing them to be deflate a little.

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