Must be the draft tubes on the UQ ??
I've a 3S phoenix (No draft tubes, about 12 months old) with 2oz overfill and it's 530grams on the button.
Your TQ is nice and light though.
Mines 6" wider than standard with 2oz overfill and it comes in at 687 grams.
For people doubting the ratings..... time will tell eh, These things are WARM !!
You will love it !!!