I can agree with that.
Try to stick to the rapid fire ratio.
2 Battleships would get creamed by one Battlecruiser so build in accordance to that.
Or try the 5 to or 2.5 style between them if the crystal cost is biting the economy.
Or 5 to 2 or even 5 to 1.
The thing to remember is that Battleships have sheer fire power with no RF against anything while the Bcruiser will take out fleets of Battleships, cruisers and heavy fighters with ease.
This is why I have always flown Destroyers, Cruisers and battlecruisers.
I like my cruisers for speed baby. Can't wait all night for a hit.