I don't find SBCL or Lispworks superior overall. Each one is better than the other in specific, narrow ways. For example, you can't beat SBCL for availability of compatible open-source libraries. On the other hand, you can't beat Lispworks for a portable GUI framework.
I use both.
As for tips, there are probably a lot, but I have to take a break from HN right now to attend a work meeting. :-)