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I would leave them intact. If you cut them in half, you are doubling the exposed surface area for drying out and when you get to the end of the tube you would have twice the awkward small nubs to...

Your buffer can kill you HERE.

I store my compounds in a large plastic bin with an open jar of water in it. With a tight lid on the bin, this serves as a humidity chamber to preserve my compounds.

For buffing, you are better off with 1700 rpm. The 3400 rpm buffers are too fast unless you use small wheels. Caswell also sells a 1200 rpm buffer.

Make sure that you read the buffing safety...