I should clarify that i was assuming forward pressure, toe height, boot compatibility, the wings on the toepiece if its an older STH, and skier information all check out and the binding passes a test. you're right, if you prerelease you should check everything else first, but a lot of people ride different settings than what the chart initially recommends at type 3. I'm 6'3, 180-185lbs, bsl 317, so at type 3, my recommended din is 8.5, at 3+ its a 10, which is where i usually ski (sometimes i'll put the heel up to a 10.5 or 11, but almost never). i got to these settings by starting at an 8.5 out of high school, and slowly over the course of 4 years or so increasing it as i got bigger and better. I've had it the same for about 5 years now, and its exactly where i need it to be.
My point is that if you prerelease, take it to a shop, and they say everything is good but you can adjust the din after signing a waiver and they ask you "where do you want your din set?" Then just start by adjusting it up just a half a din.  Don't get angry that you prereleased and were forced to dig for your ski for hours on a powder day, or than it ruined your race run, or whatever, and crank the din down super far. you can literally lose a leg. I work in a shop, and i always tell people that if they're unsure about their skier type or din setting, start low, it can be fixed a lot easier than an acl