I've been lifting 3 years and did a cycle of Havoc about a year ago followed up with PCT and a testbooster. My question is, when is a PH like this out of my system so I can safely test for a powerlifting meet?

if unsure, dont compete Amatuer, most meets/deferations have a non-tested division.
IMO, after a year it should be ok, but keep in mind that some other supplements you may have taken, namely AIs, have metabolites that could show up in a drug test. Get a list of banned substances from your federation and check it out against whatever NHA cycles you have since your havoc run.