Ok, the THAC0 of your character is 5, right?
Well, then you get to adjust it by the magic of your weapon. It is +3 to hit.
This makes it a 2.
Then you adjust it by how strong your character is. This is a factor of 7.
This now makes it a -5.
As for the critical hits, you may have something else going on that adjusts the "to hit damage of the weapon". I'm not really sure. If I saw the character (including items), I could get a better idea. As for permanent adjustments, if there are any, I haven't found any. Other than using Shadow Cheater anyways. Sorry that I couldn't help you more.
Actually, no. I take that back. I think that you could use a limited wish scroll or spell to get your stats up. I can't really remember. And there was another area in Chapter 7 that you get to increase some stats too. Sorry about that, I am a bit tired and wasn't thinking clearly.
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