Suprised how well the E9 mines zil? You should change your hobby - Zil is ethash so sure the E9 mines zil good like any other miner.

ZIL on iPollo's doesn't work as well as it does on GPUs as it doesn't store both DAGs in memory. The E9 appears to be switching between the coins smoothly so either its creating the DAG fast or its loading both DAGs in memory. This minimizes the time lost when switching and maximizes income.
Edit: iPollo just released a new Zil firmware maybe they fixed that.
Even if iPollo did not release this new firmware,the EZIL pool has just released some dedicated ports for ASICS an old GPU-s that have difficulties to keep a ZIL cached DAG,I just saw this news today morning and that by the tests they have done have increased drastically the income compared without such ports.
It is great that even ASICS makers like the producers of iPollo are consistently upgrading their product,ZIL is one of the most valuable coins if it used as a staked one offering nice applied yearly interest up to 15% more coins a year.