A 235/35/19 front with just a 12mm spacer leaves you just 3mm closer to the suspension and pokes out 7mm more than 225/40/18 Those are pretty small numbers.
With the rear setup using just 12mm spacers you are 2 mm closer to the suspension and stick out just 8mm...again no issues.
I personally don't think you need such big spacers.
My .02 cents
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