Our spa is raised (a lot) and the coping is about the same... we had an issue on the side of the pool where it is raised above the patio as the gunite was shot too thick and the shell was simply thicker on that side. We came to the conclusion that that side of the pool could be a few inches wider for the coping because it's a 'seat'... so, while it came from a mistake, we thought it would work out, and thus far, it looks fine.
Best I can say, is take some cardboard and cut it to the different sizes, and lay them up there... see how it looks. One thing for sure though is stick with what YOU want, don't let your PB tell you otherwise (they can advise and are the (supposed) experts, but it's your pool).