I still have not yet seen that the system we are using is actually hoppable. Therefore I will closely monitor the pool, and if I see anyone successfully perform poolhopping, I will change the payout system. I will also change when someone can show me a mathematically proven model. However, unless I've missed something, most people only say that the variance is not stable. This is correct, but a feature, loyal users will benefit from this...
How will you know the pool is being hopped if you don't know how miners are trying maximise their share value? Just look for unusually lucky miners? I think you need to look for a results from first principals or from a good simulation. Otherwise you're in the dark.