CEP will be adjusted at each year's SAR. First few years of service CEP can move quite a bit. As you serve longer, it is harder for RO to adjust a lot. Still can nudge it. When you are past 40 year old, CEP is fixed liao. Your previous ROs are probably senior people now. It can't be that these senior people were wrong in the past right? (of course they can be wrong but u know what i mean...)