I can tell you one more ridiculous thing about tracking. When you lodge a parcel that is under 500g you won't get a postcode for it on your receipt. It's a not a problem when you lodge only one parcel. Now imagine  that you do 10-20-50 at the same time and you can start wondering which tracking # belongs to which postcode, especially when your customer asks for it.   There is one workaround that I have learnt in my LPO from great guys who work there. YOU CAN get a postcode on your receipt for parcels under 500g. It makes tracking information more valuable and you can give tracking # to your customers in this case. However you have to ask your local LPO guys to include postcodes for all parcels no matter whether they are less than 500g or over. I do not think many of them know how to do it. If they do not just ask them to press F5.

When I lodge a parcel under 500g it is in a C&S satchel and I get confirmation of the actual address upon lodgement. Standard parcels only get tracking to the distribution centre, which is likely to not be the same postcode as the buyer.

Good luck with your further attempts to cut corners - especially when C&S is likely to be cheaper.