Don't word the NC rules any differently against Eldar. Simply amend the Holofield rules to say that NC hits are re-rolled. If NCs on LO are allowed to re-roll misses then this, in effect, would mean that LO/HFs negate each other. Eg: you fire with 6 locked-on NCs at an Eldar vessel, 2 hit and 4 miss. You re-roll the misses due to LO and re-roll the hits due to HFs, therefore all 6 shots are re-rolled, making the initial roll meaningless. As such it can be skipped.