Helldivers Help Please - Tips/Builds for Solo Bugs on level 6 Extreme?

[Royial]

I've come back to the game after a long break, I can manage Bots and the Illumaniate on Level 6 solo, it's tough but manageable. Before the Illumanite I was working up to soloing Helldive difficulty, now I can't even do Level 6 with the bugs.

There's just too many problems to deal with. I can do Level 5 without any real issues, totally manageable, but the jump to 6 is huge. Just ran a mission and it spawned 3 Bile Titans, there's not an effective way for me to deal with them since I have to run so much gear and Strata to deal with the hordes.

Level 5 I was running:
Heavy Armor
Blitzer as a backup
Stalwart as a main
Grenade pistol for nests and the fat bugs
incendiary for the smalls and warriors

I usually go health with a booster, not sure any of the other ones are more useful.
Been going incendiary mines
cluster bombs
orbital railgun
(stalwart)

I can't use this build on 6 because there's too much tank level enemies so I'm stumped. I'd like to run 6 at least for the super samples, but I can't even finish the main missions most of the time. I die before I even get too far, there's too many swarms and armor being thrown at me, and the flying bugs are awful to deal with especially if they have a nest on the map.

I'm a bit frustrated, but I think it's just a matter of getting the right gear. I don't have most of the newer Warbonds but I"d be willing to grab a few and work towards gear that will make this work. I thought I had it figured out, but going from 5 to 6 I'm stonewalling here.

Any advice is appreciated. I don't really run in groups except for friends cause I don't enjoy teaming up with randos so if that is the simple and honest answer for dealing with bugs then I guess I will avoid going any higher until I have better ways to solo run those higher missions.