Currently I have fleet logistics of 110, yet the fleets seem to top out at 64. I.E., I have a fleet consuming 64 logistics points and cannot add any other ships - even tiny fighters with only 1 logistic point - 64/110 is how it appears in the fleet panel. Add additional ships and fleet icons change to reflect they are stacked and they are stacked.

Funnily enough, I was previously able (before turn 600 and the beta opt in for v2.8) to field fleets of 110/110 logistic points yet these are all huge capital ships with no fighters. Am still deploying said capitol ship fleets of 110/110 logistical abilities created before the opt in/patch 

Full disclosure - Genius level, Ludacris galaxy, 21 opponents, all the DLC's (sans Mega Events) and the latest opt in beta/patch

luceo non uro