I've been diving that BP/W package from DGX for the past two years in the tropics without a STA. No wobbling tanks and no significant wear.
Check the strap slots in the BP, a couple of the slots in mine (aluminium BP) had sharp edges that were easily fixed in a couple of minutes.
Check the strap slots in the BP, a couple of the slots in mine (aluminium BP) had sharp edges that were easily fixed in a couple of minutes.