From: San Antonio, TX
Can you please provide more details regarding your ASW aircraft settings around the Southern CA area: numbers of aircraft, patrol zone, air support, leader ratings, airframe, pilot skill, ASW pilot skill, altitude of operation, range, fatigue levels, morale, default weapon loadout for the airframe, etc.
It would be helpful to have a feel for this in order to dissect out any possible problems with your airborne ASW setting. Without having a better feel for these settings, it is difficult for us to make any recommendations.
Yikes, is there anything else I can get you while I begin compiling that information? If not, I'll see you in a week or two.
I'll get you some of this info later today, but please note that my main concern isn't the ineffectiveness of ASW air patrols and ASW ships, my main concerns are the ability of Japanese subs to sink Allied ASW ships and the ability of Japanese subs to lurk around major bases with near impunity.
The lurking of the IJN subs around your major bases with impunity may be due to the fact that they're not getting sighted, scared off or attacked by your airborne ASW assets. There may be some things that you can examine re: your effort in this light.
If your search grid is too wide or set inefficiently (insufficient focal coverage of airborne ASW near the channel islands off CA, for example) or if it's too high (OP have commented on maximum ASW airborne height being about 1-2,000 ft for maximum effect) or if their leaders suck or if the pilots individual ASW skills suck and haven't been focally trained, all of these can explain a portion of the impunity to which he is loitering near your major bases. All of the plethora of rationale that I mentioned above have been known to impact airborne ASW, for instance.
As with so very many things in WiTP or AE, the devil is in the details. It's clear that you're unhappy with getting pounded with IJN subs. Now, what sort of settings or effort under your control can be done differently that we can discuss in detail?
I won't give away details of my PBEMs here (too many possibilities for prying eyes), but suffice to say that my experiences re: the efficacy of Allied early war ASW, Allied submarine effectiveness, Japanese early war ASW and Japanese submarine effectiveness are different than you have been experiencing. PM me if you want some additional details re: my experiences and recommendations for things to consider.