hi wneumann, i've read the post #2044 on pg. 69 of your AAR, then looked back 7-8 pages, using 'Nauru' to 'find on page'.
looks to me that your amph assault on Nauru was doomed from the start. You were unable to interdict the arrival of IJA's 22 InfDiv & 48 IndBgd, but you knew they were present, arriving in July '44. Yet you elected to assault Nauru 2 months later, w/ only 2 divs & 2 rgts, minimal arty & no combat engr units.
I don't see that you put any effort into air recon, aerial bombing, or naval bombardment of Nauru. Where's the months of bombing, or the weeks of bombardment needed to prep this target for invasion? If you'd started putting damage on Nauru in July, you could've prevented the fort build-up.
You invaded on 9/18/44, w/ a 25-ship Bombardment TF - expecting to banjo the defenders w/ 'surprise' and a mere 2:1 advantage in LCU power. Surprise, there was an add'l IMB in the hex. Also, your invaders attacked w/ a disruption (-) modifier - how many days did they spend at sea before unloading into the assault? Looks to me that they didn't suffer much damage during the unload, none of your invasion shipping suffered damage from shore-battery fire. Did you check the disrupt status of your embarked LCUs on the turn before they unloaded? Where did your LCUs load from?
I can understand your frustration at having your entire invading force wiped out, OTOH you might learn that your Nauru op was 'orrid inept, & that a plea to future opponents to accept an HR limit on fortifications is a non-starter.
Sorry for being harsh on you, but IMO you'd already lost the battle for Nauru before you loaded your invasion convoys.