First, welcom to Dakka! It is always nice to have another poster in the Naval forum

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I think you have a pretty good idea, it is one I have been tossing around myself. Having those 3 ships squadroned will ensure that you will still have some decent firepower to kick out even when braced (which will happen often). The biggest drawback is that there will be some conflicts with special orders, as in some situations you will want to reload ordnance at the same time you want to lock on. However, that is mitigated by the fact that you will also need to reload torps. Another good thing is that all 3 ships will move in unison if you go AAF, which can be a good way to jump into combined bomber/torp range of an enemy (it's a nice shock tactic).
Now, as for the rest of the fleet, I would load up on Swords. They are going to be a nice source of mobile firepower, which you will need to counter Eldar fleets since you will not have a lot of long-ranged firepower, even if you upgrade the tyrants.