He is going to have to end the winner take all on tx fees.
Transaction fees are large enough now that the system will probably have to change. At some point transaction fees will be the majority of the reward and then the existing system becomes more like solo mining and less like pooled mining.
The likely solution will be to have the transaction fee included with the mining subsidy when the score is calculated for the share submission. This unfortunately removes the 'bonus' aspect of being a block finder though. Perhaps some mix of the two.
Yeah Maybe ⅓ to the block hitter and ⅔ to the rest based on shares.
In my case over the last 5 blocks ⅔ of 1.90 = 1.33 btc.
It would still encourage the bigger miners. And let the small miners to grab some of that pie.
So I will do what you want it is your pool.I am still here mining away.
But with no merged coins and my bad luck on not hitting one of the last five blocks. I did hit the sixth one last July and got 0.055 btc

I am having a bit of pain. About those 9.5 coins given to the last five block hitters.