It's been a couple of years since I fine tuned the PIV in my A3000/060 to my LCD but I will be having to do it again soon as i've been rebuilding it as time permits recently.
You might want to try the tool linked at the bottom of this page as it's "easier" than the default P96 tools. Wouldn't be a bad idea to upgrade to the most recent version of P96 from this page either though not strictly neccesary.
http://lilliput.amiga-projects.net/Picasso96.htm
