Suggest You look at installing a Honda thin fan with shroud on the inside of Your radiator. You do this by extending the rad perches and moving the rad forward. Contact Me offline and I will send You information. wmbutton@gmail.com BTW: this is a U.S. product called "Flex O Lite".
Sorry I failed to answer Your second question. Yes I use a SPAL fan in front of My +8 Radiator. It works OK at slow speed (In traffic) but at 70 MPH pulling a long hill My +8 heats up. I must slow down to about 50 MPH to cure this. My theory is the Spal Fan in front acts like a air blocker at speed.