I've brought GH and powders but I don't mix them in the same orders , just a personal preference to aid in getting them past border force.
With the insurance I find it's worth paying , even after adding the 20% its still saving me so much compared to buying locally.
Also just on tracking numbers for the us here in Aus I typically get mine around a week or so after payment , you just have to trust the process.
@Qingdao Sigma Chemicals would you have an estimated timeframe on when the Aus warehouse might get a restock of GH . Thanks