It's been a while since I worked with log home companies (unfortunately - I love it!), but I do remember having some success with not using the crossed corners at all. Maybe it could work for you too? Try crossing one wall with another, making sure that just one of the wall uses the 'Start with Half log' setting under Log Options.
If you need the top log to extend, you could play with insert an empty opening into the end of the wall, using Solid Element Operations, or to get a much rounder log, use a library part or beam.
That's all from vague memory, so excuse me if it doesn't suit your situation.
Cheers,
Link.