[AshleyC]

I quite like the thought that you have put into this. However, I rarely smooth-call with big pairs.

It also depends on the stack size of the raising villan, if he has ~ 70bb or less I am much more likely to smooth call in position, as it will be easier for him to hopefully get pot committed to his hopefully 1 pair hand. I'd never smooth call against a fellow 100b + stack.

If you want to mix up your play and cant think of a way to do this Harrington in his book advocates calling with say red aces ( 1/6th of time get them) or same colour aces (red / black aces - 1/3). Similarly you could obv do this with other pairs. This is a good way to truly randomize when you do it.