Thanks for the link to the terminal crimps. The humming only happens when car is running so I'm thinking maybe my gnd/earth point isn't good enough. As for fm radio being not very good sound I think one of the wires on connector is bad as I do recall one of them bent like it was about to break. I thinking of getting a dab aerial that goes on front windscreen so won't need fm anymore.I'm pretty sure that these are the terminals for the speaker connectors, https://www.ebay.co.uk/itm/50-x-Junior-Power-Timer-Terminals-Contacts-Genuine-TE-Part-Part-No-927770-3/140987003253?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649 , they do different wire sizes so you might want to contact the seller for further info.
As for the humming you may have to reposition the route of the sub wiring, or put some special rings around the wires (I can't remember what they are called).
I've got a vagcanpro tool now, what more can I do with it that vcds tool can't?