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1) Is this push good assuming a weak-tight SB, which was my read at the time?

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Yes, if you believe you have some fold-equity then you can get away with it.

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2) Is this push good now that I know SB hasn't raised on any street since Level I?

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No. You're hoping for a race at best.

In conclusion, I fold due to tightness of SB, if he IS still playing weak-tight and not beginning to open up, he should give you his SB or you can push when he completes in future orbits, assuming nobody else enters the pot. I think there's still time to play here...