You need to measure your chamber volumes to really know how your compression ratio will be altered. What piston manufacturers say the compression ratio will be and what you actually get can sometimes be very different. I don’t think the uprated oil rail fits with Caterham dry sump systems, which may be worth considering if you ever plan to upgrade, which may not be a bad idea given your current situation! Have you had your injectors flow tested as another safety precaution? I’d definitely get the car mapped, potentially not with the same person as last time if it was pinking! Increasing the c.r. would only make that worse, it’s probably worth making sure you only use super unleaded too.