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My experience with regular cassette tapes says definitely go normal speed. Record a CD onto tape, and then dub normal and high speed and compare. The difference is obvious. Now, it doesn't seem like you're going for the most scientific approach in terms of needing high fidelity, so it's pretty much your call. I doubt intelligibility would degrade, and it doesn't sound like you're using these for any audio analysis or anything, in which case obviously every little bit of quality is important.
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