From: Bexhill-on-Sea, E Sussex
I've never really found AV's, AVD's, AVP's useful against the AI. They seem like they should be used to setup forward airsearch bases far from any fighter cover, and vs the AI anything within the enormous betty range with it's lazer guided torpedoes without heavy CAP is just easy meat.
Trying to sneak in and setup an airbase for search with avp's anywhere close to japanese held islands is just suicide by betty for that AVP along with any supply ships you might try to send in.
I do find agp's useful immediately after taking a small island. Plop an AGP down on a recently conquered island and move a bunch of torpedo boats in for defensive purposes.
Never found a use for AG's. (I use them to haul supply to bases where I expect to get mauled during the resupply attempt)
I tend to use AD's to add repair capability to forward bases for destroyers.
Here's another useful thread about auxiliary type ships.
Put an AG with supply in any port to support the little craft such as SC, AMc, AM just like an AD support DDs, an AS supports subs. They take some of the wait of of the base especially small ones.
I do use AV, APD etc at forward bases, you will occasionally get hit but the secret is not to leave them they for very long. Best way to use them I've found is to park them at a small Pacific Islands base, say Johnstone, Palmyra, Baker to sopport the PT a/c. If the a/f is also built upto level 1 and a F group stationed there with air support they make very good search bases and double as staging posts for air unit transfers. If you get them up to level 3 then DBs, TBs or even MBs can operate from them. The AV/AVP support the PT they do not support the land based a/c, but the the land support will support PTs but if they do that they will be unable to support other a/c.