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I would suggest drilling them slightly larger in situ and using close fitting or even fitted bolts, though that's kind of hard on something like that. Those bolts are loaded in shear almost exclusively, and there's lots of material beyond the bolt to resist shear-out, so redrilling them isn't going to weaken it in any appreciable way. And larger bolts will have greater bearing area which in turn reduces the tendency to egg out again.
If you could sleeve the interior of the inner pipe with something like compression tubes or just a heavy wall, close fitting inner sleeve, you could use friction to your advantage, but that's a lot of work, and requires disassembling the tower.
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