This looks great overall, the only thing I would change is to allocate 2/3 for stored ETH overtime and do 1/3 for tx fees;
It makes more sense to me to reward/incentive the long term vault and therefore safety aspect of Gnosis a little more than a trading machine one.
In fact there is a good chance, in my opinion, that Safe with less transactions (likely multi-sig) were more properly used than those with high frequency transactions (likely single sig or two at most). Of course there is that middleground as well, combining safety and usage and that is why this allocation makes sense but 1/3 or 1/2 is what I would vote for.
Either way it will be a fine distribution thank you.