Pool Luck
119.29%

So - in fact, it finds even more EXE blocks, than it should, in average according to the hashrate.
This figure will be closer to 100% on larger number of blocks found.
In other words, EXE efficiency is not affected by merged mining, and MON/PLX blocks come as a bonus without affecting EXE efficiency in any negative way.
By the way, efficiency of any pool on EXE with 45 seconds blocks should be a bit less (maybe, a couple of percents) than expected because of quick blocks (fast network synchronization issue), and this is normal.

Meanwhile, first payouts have been made, please check your wallets.