They've made different versions of the Nook Tablet. The oldest ones (from what I've read) will try to boot from the card every time.
The NT I have, I have to plug the cable into it and connect to my computer to get it to boot from the card.
As to the text size on the browser, I believe that's a function of the browser. You might want to try out different browsers (available through Google Play) to see which one you like best.
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