Car was perfect except for that understeer. However, it happened on every sweeper, independent of camber. It might have been due to cold pavement and tires, but it did seem to be consistent.
As I mentioned Murray back when you got the car, fitting a big front sway bay on the Miata is a backwards step, you give away all the front end grip and as you've experienced the car washes out. I would suggest you refit the stock front bar and fit a 17.5mm rear bar, run the rear dampers as little softer and then get a trick alignment that compensates for the rear being a little loose. My NC is almost totally neutral, all most zero understear. Did you uprate the bump stops, very important on a Miata. The car has a huge amount of body role, trying to eliminate the body with the shocks will only take away grip, the car needs to role and lean on the bumpstops as it creates massif weight transfer to the weighted side. As you have discovered this isn't an S2000. No need to reinvent the wheel here lots of stuff on line.
Conventional wisdom says FWD Big Front, AWD Big rear bar. The Miata is none conventional due to its weight distribution and its softly sprung. Stiff dampers and a big bar in most cases are a backward step in a softly sprung car. Once you go down the road of fitting stiffer springs everything changes and stiff shocks, are needed to control the springs, the Koni set is ok but in reality its only a compromises as the dampers at full stiff overpower the springs, which is why the need to be run 1/2 hard. tire pressure needs depending on temperatures 30F - 32R, soften the rear if the rotation is to aggressive. The alignment is one of the most important mods on the Miata.
Base line: Front camber 2.3, rear 2. rear tow, zero, front tow, just a tad out to sharpen up the turn in. Mild rotation is always better as you can keep your foot in it, and it usually points you in the right direction. I played around with my car for over a year, its now just right for my driving style.
Good luck Murray, I'm sure once you got it sorted you'll be kicking our arse.
This advice was given to me by Chris Harvey. US National winner.
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