well, this is clear...
the big "E" has the same 24 space R slots than Yorktown and this is the worst part of this ship by far, as it only allows to put 5.25 or 5.51 (with only 1 bind of ammo) and it can't carry HH or PHH...
right now every other ECV has the chance of carry HH, even KM cv1.5 can carry HH and in US you have to wait up to CV4 in order to do this.
considering that an event CV is a "special" ship it dosn't sound bad the idea of giving a minimun HH capability
so my propose is to go from 24 to 26 in R slots, allowing Enterprise to carry PHH with minimun ammo (that will be something like 10 phh shots)
it's not a big change and the lack of ammo, only PHH capability and bad placement should compensate the 8 slots