you should have:
8 metal plates @2mm
1 dished metal plate @1.5mm
7 fibre plates @3mm
(8*2)+1.5+(3x7)=38.5 mm total stack height (new)
anything less than 36mm or more than 40mm is almost definitely going to cause a problem
the worn centre statement sounds odd to me too, without a good look it's hard to speculate
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