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Welded washers are exactly how it should be done. The rear suspension pieces are under tremendous forces under acceleration and braking. Don't just casually dismiss these forces. 11:35 1st gear and 7:31 R&P and a modest 200 lbft of engine torque =2800 lbft of torque acting on the pivot points. Slots might not be strong enough to resist these forces.
Set the rear roll center and anti-squat where you want it, then weld the washers in place. Be as accurate as you can with your measurements. Small changes make big differences.
I'm not trying to nitpick, just trying to help you address any issues before the car hits the track. And be careful to keep roll center centered on the chassis centerline.
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