I also have a '95 with the DZA1 computer, and I bought an LMS chip about a month ago.
I cleaned the contacts per the instructions and installed it. The car fired right up, but I noticed no difference at all. I called Geno, and he said to clean the contacts until the copper traces underneath the solder are completely exposed, and to disconnect the battery for 30 minutes as well. Sure enough, that did the trick!
I had left the panel mounting bolts loose, so a few days later I went back to make sure everything was routed properly and snugged down. In doing so I jostled the computer a little, and it went back to acting like the chip wasn't there. I took the computer back out and noticed the contacts had tiny scratch marks in them, so I used toothpaste to polish them until they were perfectly shiny. Then I cleaned the connector 5 times with rubbing alcohol to make sure every molecule of residue was gone.
I've worked with computers and electronics for most of my life, and I've never seen any connection that's so sensitive. If you haven't cleaned that connector obsessively enough to make Howard Hughes proud, I can almost guarantee that's why your chip isn't working.