Interesting responses so far. And they differ from my own initial impulses, which I find VERY interesting.
My gut reaction to this thought was that those ASFs really ought to check at least one important box. They needed to be able to turn and burn with a lot of other Clan fighters. The Visigoth, which is often held up as a gold standard, can move 7/11. Yes some Clan fighters can go much faster than that, and some are slower, but in my head this meant that since the Visigoth has been so common in Clan ASF forces, you'd really want something that can match or exceed the speed profile of that. That way in atmosphere you at least stand a chance of possibly dogfighting that other fighter effectively and getting to a good spot such as behind it to take it down.
If you can move 7/11 that matches or exceeds the Visigoth, Turk, Sabutai, Jagatai, Jengiz, Scylla, Kirghiz, Ostrogoth, Hydaspes, Xerxes, Ammon, Tyre. Which means you stand some chance of getting on (and staying on) the six o'clock position of any of those.
What's left is lighter ASFs, which can be a real problem. But your weaker IS weapons also may stand a better chance of doing critical damage if/when you do score a hit.
So for me, I was wondering if the sweet spot on this might be platforms like the Tomahawk (8/12, not too shabby), Hellcat II (7/11, BAP might be useful for the unit as well as the individual fighter) and perhaps even the Rogue (long range weapons good, plus rear weapon for pesky interceptors).
I'm not sold on my own logic here. Curious what people think. I could see someone perhaps argue that I'm putting too much emphasis on the speed profile and fighting in-atmosphere, at the expense of other things that might make my choices look foolish.