It sounds to me that it may be a problem with the top lever spring. If the spring were shot, but not completely broken, that could cause the off face symptoms you describe. The rotary bolt locking mechanism that Smiths rely on for "never shooting loose" (prepared for incoming flames!) is dependent upon a fully functioning top lever v-spring. I've replaced several intact, but weak, top lever springs with new stiffer springs that totally eliminated the problem you describe. I'd definitely get this issue resolved before addressing your POI issue.
Food for thought and good luck!
John
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