i agree w/ the idea of 'staging' an amph-assault - by which i mean shipping out from Pearl or SanF to an intermediate base, unloading there for a bit or rest/training to recover disruption, before loading out again for the final leg of the journey.
the trip from Pearl to Guam is just too long, esp. if you're loaded on an LCI or LST. if you accumulate too much disruption during the voyage, an assault can be defeated before it even hits the beach! ntm that some of the shipping could use a day or three of minor-damage repair at the intermediate base, which should have some pre-positioned NavSupport and AR/AG ships.
another consideration is, despite my best efforts, some LCUs leave a fragment behind at their port of embarkation, usually a brace of Support or MotSupp - un/re-loading at an intermediate base gives me the chance to add these left-behind guys, provided i've found them quickly.