Your first designs are better than my 10th or 20th. A lot of people here like the dedicated designs, but I prefer my missile cruisers to have both ASM and AMM. I just build more cruisers if I need to.
I agree with you for big ships, say 25.000 tons and bigger. For ships below, say 10.000 tons, it is pretty much impossible (at reasonable tech levels) to have both, reasonable ASM _and_ AMM capability. Look at Black´s ships, which, I agree, are generaly good.
The Salamander has 2 ASM and 2 AMM tubes. None of both will do him much good in a fight vs. an enemy even a tech level or two below him. At that size of ship (and tech) you need as many ASM tubes as you can get your hands on to get some missiles through and also as many AMM tubes as you can get to intercept even halve of the missiles, the enemy is throwing at you.
You also have to keep in mind, that for those two ASM tubes, you need a dedicated firecon. The more tubes you mount , the less mass that firecon has _per tube_ (up to the point, where you want to have a second one, as backup or to engage several targets at once) and the same goes for those 2 AMM tubes.
Scrapping the two ASMs, would free 500 tons. Add in the mass of the Beholder-66 _and_ the res-60 sensor and you have got a _lot_ of mass to strengthen your AMM capability.