Stot, are you using the book pedal box. I wasn't very happy with mine as I got over 1mm of flex at the master cylinder. Doesn't sound like much, but it is quite a bit at the actual pedal. I added an angle across the pedal box, and angles either side that hook around the chassis rail. I also added a stiffener under the floor as well. Made quite a difference and the pedal felt less spongy afterwards.
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