I played missions 5 through 7 in the Crusader yesterday. For mission 5 (Sprague) I had one class-4 Pyros, two class-5 Pyros, two class-5 Angelito, and a Slingshot missile. Then for missions 6 and 7 I went with a loadout of two class-4 Pyros, two class-5 Pyros, two class-5 Borroco shieldbusters, and a Starkiller torpedo.
I too managed to kill all the Rheinland ships upon launching from Sprague, but then got the timeout message. That happened on FOUR tries! Then on my next try I nailed all the ships except for one fighter that was 1000m behind me, and so I just got into cruise and moved on. I could've gotten them all if I'd had a Catapult launcher instead of a Slingshot; do you know if there's anywhere in the game to loot a Catapult? (Or a Starkiller; both require level 10 to buy)
Oh, and I got class-6 weapon drops (Stealthblades, I think it was) off those Rheinland ships. Too bad they suck.
Anyway, then I bought my Starkiller, and hopped over to Cadiz for two Borroco guns. I mapped CapsLock to turn on and off one of the Borrocos as needed. (I wish the weapon grouping commands worked right; stupid bug where you have to click the mouse button for each shot if you map it to Fire Weapon Group.)
On the trip back from GMG Station Glorious, the second wave of fighters (right before the jump hole) never even PASSED my ship. Yeah, I took out all three in the "joust" using Starkillers. Shoot-shoot-BOOM, shoot-shoot-BOOM, shoot-shoot-BOOM. That's why to get a Borroco or two.
On the escape from Stokes, I also took out the cruiser before Tobias arrived. Then in the Tau-31 encounter where you run away from the battleship to the far tradelane, I KILLED the battleship before doing that. And against the pair of gunboats, I killed one even before Tobias said "It's you and me against 'two' gunboats". Can't beat them Starkillers.
Now I'm considering the best loadout for a Dragon. Two Borroco in the class-5 slots and four Pyros Type 3 seems pretty unbeatable, though I might mix in one of the Kusari 8.33 refire guns to aid in shooting down mines and with the "last bit of shield" effect. The Adv. Tarantula is as good as the Pyros Type 3, but doesn't match the Borroco's targeting stats.
As for the Anubis, being ready with six Pyros Type 3 guns ahead of time seems like a fine plan. You'll want Borrocos equipped for mission 11, although missions 12 and 13 don't need the shieldbusters. A slightly more powerful loadout for mission 11 would be class-6 Debilitator shieldbusters with Adv. Tarantula guns, but I'm happy with the Borocco/Pyros.
For missions 12 and 13, one Catapult launcher might be worthwhile, since the powerplant will run down pretty quickly even with only five Pyros guns, and it'll contribute good damage alongside the Starkiller.