I eat calamari all the time and usually don't have a problem. Squid seems mild for me. Shellfish is very iffy, but shellfish and beer together is the killer. Unfortunately, that's my favorite combo. It seems everyone has different triggers though. For me the real issue is alcohol, beer specifically.
I think I went too long thinking that it was just one thing when it really was a build up of a lot of things... basically lifestyle...have a flare up and blame the last thing you ate but it was actually a week or month of too many beers, questionable diet and weight gain.
But I have been able to keep it in check for a long time with regular blood tests and medication. I get my uric acid levels checked every 6 months. Keep it well under 6 mg/dl long-term and you'll be able to get away with a lot more more often. If you have problems, it's really worth keeping tabs on your uric acid levels. Keeping a consistent healthy weight goes a long way too... another thing I struggle with