@Badseed apologies for the late reply, I seem to have lost track of some such questions. Alternalo’s RF MM guide covers this subject very accurately, excluding the MM-exclusive bits:
Rapid Fire yields the best performance with 60-400 rof weapons. Going below 60 will result in wasted potential, because the initial shot isn’t boosted by it.
Another problem with the skill, it overrides your spread, which cannot be decreased by weapon accuracy mods, so you either have to stand close to your target to maximize your performance or use weapons that bypass spread mechanic, such as:
Trident Launchers: Shoots 6 heat seeking rockets in a volley, which makes this weapon one of the best choice for this build, as you can practically use it from your maximum range with maximum performance.
Laser weapons: Similar to tridents, lasers will stick on the closest target in range and apply the increased damage from Hightened Senses. Since laser have a very high tick rate they don’t benefit from the increased rate of fire much, or at all.
Other weapon types that have great performance with this skill:
Bolters: These have an ideal 240-300 rate of fire, the only downside is that you must use these close to your target because of the spread. Max’s Molten Metal Projector is a great choice, because it fires extra projectiles and are available pretty early. Great for applying ignite.
Shredders: These 1 handed shotguns are short range, but it’s also ideal for Rapid Fire. Their stun attack strength can save you from being trained by enemies.
Thermo Cannons: While their rof is almost suboptimal, their aoe makes up for it, can be great to clear up large crowded areas. Bunkport’s Tsunami is a great choice, beacuse it’s damage is entierely splash, and deals spectral damage, which can trigger phase for 50% extra damage if you have some phase attack strength.
@ruedi I’m afraid I don’t remember the exact number off the top of my head, but it should be roughly 100. All Retrofits provide 8 points per level, maxing at 56.
We’ll hopefully get that issue fixed sooner than later, so Drone stat distribution will be more lenient.
On Luck on the Drone, I’d advise against it. Luck on minions doesn’t affect the player, and the Drone itself can’t reach ~1200-1400 Luck to have a visible effect on its own kills. Of course it won’t be completely useless, so it’s an option if you’d like that route.
On +minion damage, definitely. This build opts for support over damage, but the Drone can be a decent damage dealer if you build around it. Urthemiel’s guide takes such an approach, if you’d like some insights into that route.