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I believe the link directories are fine within reason. Don't rely only on link directories but submitting to them I have found did any harm. I think if you have a good mix of link directories and natural links you will be fine. I would avoid low page rank directories.
You can see what kind of re-direct you have set up by looking at the .htacess file.
A 301 redirect from t-chek.com to thchek.com would be your best bet, it will pass through the link juice from links pointing to t-chek.com
You would need to edit the htaccess file for t-chek.com
Use "-" instead of "+"
Here is an article I always have bookmarked for URL Structure, even though it is from 2006, it is a good source of info from Rand.