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Sounds like abs rings then, check each of them for cracks or corrosion.
Does the car only hesitate when cold? If so it will probably be the pre lambda.
If track performance is your goal then corner weighting is your best option. Car wont look evenly stanced but it will be nice and balanced on track. I just bent the bumber mounts up out the way and had no issues, sounds like you need higher spring rates though. Look at FK springs as they are...
If you set the ride height the same all the way around with your weight in the front seat that should be fine due to the cars natural forward rake. Get the car on level ground and measure from the centre of the wheel to the wheel arch. I was 33cm all-round on AST's and 15" wheels and it looked...
I personally think the RS3's are a bit Barry, the BM albeit a great car a bit dull but the c63's noise is just car p**n although also a bit Barry. My head would say m4 but I think I'd always regret not getting the Merc.
Out the OP's choice it would be the M4.
Wheels will be fine as is for a track set. I have both my sets black as you can't see the brake dust then, they just look matt.
Get a set of camber bolts as well as its a cheap worthwhile mod for track days.
So was going to slot my AST's top strut hole for more negative camber (cant do the bottom hole as there's not enough material to file down) and to fine tune the adjustment would need adjustable top mounts, thing is I've just bought PMS top mounts and don't want to fork out again for the grams...
9kg is plenty to hold up the front, you go stiffer at the rear to reduce understeer or induce oversteer....or both! It all depends on you're driving style really.