I just suck up a tune for the 04 Subaru Impreza S1 class , It works best on the Surfers Paradise road tracks.
I gave your tune a try. It felt a little bumpy and had next to no grip in turns. maybe that was what you were going for in order to keep the speed up.
I shared my tune for the 98 impreza. same class and level. That one is grippy. Check it out. would love some feedback.