Definately is a limit on injectors size GReddy recommend no bigger than 150% due to the rescaling of the AFM voltage essentially running too much ignition timing as the map scale is way out of whack.
Burnt coils were a function of the dwell voltage on the e-manage blue, read the instructions all day and it wouldn't explain that fact, RX8's suffer the same fate...the ultimate is a different kettle of fish apparently, anyone burning coils with this may be installing wrong.
Either way I would still recommend the zeners as it regulates the trigger voltage down to a Nissan friendly 1.3v...the e-manage didn't have the luxury of altering that low.