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My reloads have visible crimp around the middle of crimping cannelure, I can say that's a heavy crimp. Safe to shoot ?
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You might give us a picture, but in general an 'easily-visible' roll crimp into the canelure is fine.
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I couldn't find any dead-level surface in my house
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You don't need a dead-level surface for a balance beam scale. As Lee's instruction say: "Turn the zero adjusting poise to align the beam pointer to the zero indicator on the base." Using any reasonal flat surface, this should compensate for most slight real-world conditions. (You
did zero the beam?)
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Mine are at 64.40mm [OAL], still safe?
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You are within bounds (and apparently at the actual design canelure length).
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as close to 29.7 grains as possible. Im sure not all of them are exactly 29.7 grs. Safe or not? Tolerances?
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Winchester's max for that 170FN/W748 combo is 32 grains.
http://data.hodgdon.com/cartridge_load.asp
You are well below that, and +/1 a tenth of a grain is standard ballpark. (BTW: Which manual did you take that out of?)