Going on that, what would be the baseline for that if we were skipping Cluster Rolls?
For the SRM-2, Ultras, and low-firing RACs (2-3), that's going to be hard to manage (mostly). There is no "better" for them, really. Though, I guess the Glancing and Direct Hits fit that mold quite simply. Nasty for an Ultra AC/20 hitting a Narrow/Low Profile model, though (not that it isn't nasty now).
Of course, the heavy LRM racks and HAGs can get pretty funky, too. The 20 has 6, 9, 12, 16, and 20 as its marker (12 and 16 doing Aero representation). In most cases, they're not going to get that MoS of +4 for a full Cluster Hit.
Then there's Artemis and NARC representation, too. The HAG also has a similar bonus/deficit at the Short/Long Ranges as well. How does this affect this dichotomy without a Cluster Roll?