Anyone confirm or bust this, cause i'll be gutted if they don't, but i've waited 3 days in 3 different giants camsp i've cleared out, n no luck......

That's what I was going to say, is to wait a few days in game, I have seen them come back to an area that I know for a fact I cleared.

Where was this?

The respawn time is longer, now. Many places are supposed to take about a month to reset, instead of the previous 3 days. Try again in a month.