I've had male spiders that were perfectly able to lock up and breed, I think the troubles that you are having are more likely because the male is young. I've had several young males that had trouble figuring out what they were supposed to do no matter what morph they were or how large and theoretically capable. Most will figure it out eventually though some do seem to take a few years.
Also, as far as visual locks, that doesn't mean he's not breeding. I once had a male het albino that I bred for several years, not once did I ever see him lock up. Never saw him courting, never saw him showing any kind of interest whatsoever and yet all the females that I put him with produced eggs every year.
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