Ah, I see, I misinterpreted.
For me, Group E just lacks performance outside of early-mid game. Once your stats are maxed out, the defensive abilities don't help that much in most dungeons, and the IQ group E lacks exploration utility like all-terrain hiker, stair sensor, etc to make up for lack of damage output. I find Acute Sniffer pretty useless and doesn't make up for much. Also, IQ group E is the only regular group without Trap Buster, Trap Avoider or Trap Seer which really hurts performance in higher difficulties.
Unrelated - I didn't get any Ascension stone Mk2 from completing Zero Isle Centre. I don't need them in my current playthrough (randomized leader, regular partner whom i do not plan to evolve) but maybe the randomized leader choice affects this script and is something to look out for in future versions?