proper aero mods

[judgie]

most of you know what my 1303 looks like and what i do with it.
looking at getting some more downforce and better aero mods on the car.
at the moment i run a small front spoiler and a F3 lola rear wing, but no side skirts or flat floor and no rear defuser.
thinking along the lines of a deeper front spoiler with a splitter into a flat floor running into a rear defuser with some side skirts.
also i am going to mount the F3 wing lower and further back with mounts going to the frame horns rather than mounted on the flexable body which it is now, it has bent the panel under the rear window so i know its doing somthing
max speed is around 100/110mph and most of the time its spends it's time around 60/70 mph so i know the areo parts need to be quite big to work at these speeds.
any ideas and proven mods that work?