Your luck must be better than mine!
It's just that it's a long process of rolling for all your units (especially for Escort heavy fleets) INCLUDING Hive Ships (that's Bull**** right there, imagine rolling for Hive Tyrants in 40K!)! I found it both boring for me AND my opponent. Not to mention that a couple of turns bad luck left you dead in the water (ether?) and properly on the back foot for the rest of the game.
I kind of prefer your House rules to be fair; personally I scrapped the whole processes and went with:
All Nid ships have the Ld of the Nearest Hive ship (Highest if more than one)
10 for Celestial Phenomena
5 otherwise
Crippled units outside of Synapse must try to disengage (you could use an Imperative to ignore this)
In truth I scrapped my 'Nids soon afterwards and went with a Tau fleet instead, so these rules didn't get thoroughly developed.
I'd like to see something along the lines of the current 40k Instinctive behaviour, with Feed and Lurk, but this would require designing and testing, and could just end up with a re-organised table as is already (a table for each type? No Thanks!)
Ok, I've rambled buy you see my point! Someone said during the whole NC thread that games should be FUN. To, me this isn't!
If you can get IB to work for you, than your luckier than I am, or I've missed something. 'coz it's never worked in my favour.