Try interparcel.com. they will give you four delivery options depending on weight and size of parcel, you can track it acrossthe route and see who signed for it on delivery. They also have a list of restricted/prohibited items.
which you can follow if you choose! You will need a printer as there are customs and freight forms to download, my stuff gets to USA in 3 to5 days.
I gave up the Post office as a bad job, Airmail took SIX weeks inspite of being identified as such ,not once but twice!!