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It definitely sounds like they were overtightened. Or you bought wheels that were too big for your blades and they're rubbing on the housing.
ABEC7 spins faster than ABEC5 in your hand, but many ABEC5 bearings use a kind of grease that heats up as you ride and they're ALMOST as fast as the 7's.
I have 5's and 7's and I usually use my 5s because they're cheaper to replace, and my abec7's are almost impossible to open and clean, so I only use them on tracks or clean trails.
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