Might as well go private and ask for diagnostic angiogram and get done with.
Unlikely to progress to significant stenosis in 4 yrs or fatal mi in 10 yrs for totally clear arteries without significant risk factors.
If arterial plagues noted that do not result in critical stenosis requiring atenting, LDL needs to be well optimised and in rare cases where LDL is low, apo b can be used as a marker in such discordance.
Well this is not standard medical guidelines, btw. For those who can afford it, can consider.
In years to come, it is likely that lower ldls are going to be in the guidelines as at current levels still have significant silent heart diseases.