For the moment I have removed 0.86 cc from the head by filing some Singh grooves copying Motopsycho's pics. I have crunched the numbers and removed base gaskets to set the squish at 1.5mm which should hopefully be OK. It turns out that my squish was originally even wider (2.2mm) as I had been been using a vernier to measure the piston depth and the height of the flange on the head, but discovered my vernier is out - measurements now taken properly with a micrometer and solder.
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