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Hmm, you might find that even a hint of skipped steps while racking out will be a good indicator of issues when you get it out under the stars. Mine did that but seemed fine with smaller movements (400 steps, vs 10000) and I found it unusable under the stars.
Anyway, sounds like Robert has given you some solid advice: a PG5 Nema 17 should be fine... a quick look says you can get a max torque of 283oz-in. My motor is rated at 198oz-in and is performing fine while full stepping at < 75% max rated current.
I was warned off using the 8:1 shaft on my Moonlite by Ron from Moonlite, but he didn't specify why exactly, maybe just some concern about potential for load on the small shaft? I dunno, but I ended up attaching mine to the main shaft.
Mine's fairly different from what I posted previously. Different motor (previous one was rated at 2a, and trying to run it on the main shaft with a driver capable of delivering at most 0.75a was futile, even full stepping), and different housing etc.
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