I have never tried your pool, but are you sure it is actual pool hoppers and not people who just setup your pool as perhaps one of their backup options in case their primary pool were to go down?
I primarily point my miners at Ethermine where they normally stay, but every once it awhile they fail-over to one of my backup pools, such as Nanopool. Since the mining software periodically rechecks the primary pool to see if it is back up, I may only mine on the backup pool for a short period of time before the hashrate moves back to the primary pool. I would hate to think this sudden inflow of hash power to my backup pool would be considered pool hopping and be penalized for it.
The pool hoppers I am talking about are the people who jump on the instant we hit a block with hash power equal the the amount of the rest of the pool combined, stay till 30% variance and leave. They always leave at exactly 30% and always jump on as soon as a block is hit. Those are the ones who we have stopped, and some have noticed and removed us from their bot list, others still continue to do it because it's all run by bots and they never actually check to see if they are making anything or not.
People who only mine part time are not considered pool hoppers. Just the ones like I described.