There is no way to defend against this type of attack (thats why they do it!) Even if the defenders had 30 guys sitting in the tower waiting for the next attack it would be almost impossible to stop.
Hop in the shore battery, or up from the next base in buffs, and sink the CV. Grab a 262 and go goon hunting - they're not going to take the base in 5 minutes unless they have a goon on station. Get about 6 like-minded teammates and fly in from the next base high in fast planes. Pork ords and troops at nearby bases. Find a base that's more important to them than this one and organize an attack on it.
Or best of all, since you hate land grabbing and war-winning, just ignore them and go somewhere else to fight. Why do you care if they take the base? Does it ruin your day knowing that somewhere else, maybe in another arena, other people are having fun in a way you don't approve of?
Is this the type of game play that Hitech wants. Unstoppable hordes going from base to base just flattening everything like a horde of locust.
Perhaps what you should be asking, or better yet suggesting, is what exactly they're supposed to do about it.
Zone-based ENY would be a start, but they don't seem too hip to the idea.
They already upped the town capture percentage to 75%, so apparently that wasn't the source of the trouble after all.
Btw, you mentioned going to LWOH for better fighting - when I logged off LWOH, there were 52 nits, 51 rooks, and 33 bish, and no more than 2-3 nits and rooks visible on dar along their whole front. Most of the nits were hitting A43, and just about every one of those 51 rooks who were in the air were at A5, there must have been 40 of them (and they still hadn't taken the field after 15+ minutes when I logged, nor had the nits taken 43 - they seemed to give up after we killed their goons and came in only looking for vulches and picks, which shows it
is possible to beat a horde attack, even after they've taken FHs down). This is not an issue limited to one one side or one group of players.