Questions Regarding Submarines and ASW

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From the recent FAQ update:
 

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Why enemy submarines keep sinking my battleships?
The game simulates in an abstract way the importance -and annoyance- of submarine warfare. It is expected that battleships without sufficient escort to be very vulnerable against submarines. 

The ASW value of a task force is based on an average value taken from all ships of the task force. So if you have many battleships with low ASW and a few exceptional destroyers with very high ASW, the overall effectiveness of the task force against submarines is expected to be mediocre at best. The average value simulates the undesirable noise caused by bigger ships which conflict with the effort of detecting the stealthy submarines. 

In order to be more effective against very advanced and stealthy submarines of the enemy, it is advised to issue dedicated Task Forces, specific for hunting down and destroying submarines and not mix them up in  a large, less effective group.

So, ASW value of a task force is only the average of all ships?

So if I build a dedicated ASW DD, with for example an ASW value of 2000, a task force of 20 such DD's will have the same ASW as a task force of a single DD, because the average will be 2000 in both cases?

And if I have an ASW CL, with an ASW value of 1000, and I indend this to be a "destroyer leader" kind of CL, a task force of one such CL and 4 of the DD's will have less average ASW value than a task force of just 4 DD's?

So for the purposes of protecting my battleships from submarines, the best TF composition would just be the battleships and as many of the 2k ASW DD's as possible, with NO other ships at all, as they would only reduce the average ASW value further?

And for the purposes of hunting down enemy submarines, the best bet would just be single DD's, as they would have the same average ASW value as a larger DD flotilla?