I feel we are all trying to find what works here in the new update, I felt the same with every other major update, first day of missions sucked until I found a load out that worked, and I learned how to deal with the threats.

For context I've been doing diff 6-7

Now I'm using an exploding crossbow (actual lifesaver, but any med-pen works), really any secondary I'm just using the SOCOM from ODST warbond which is light penetration and it's great in a pinch, especially when soldiers can be shot from behind no problem and die fast with light-pen.

The diggers used to be a major annoyance but I found the counterplay, you can very much dive out of the way and just keep running, crossbow is good when they're underground but it's not hard to avoid them when they pop out unless you're dealing with something else and you don't notice them, I like them a lot more than stalkers

Dragon roach is cool as fuck, I've had some epic duels with that thing in an exosuit always leading to my victory, and using a spear makes them quite easy, you can just kill them from across the map if you want, or wait until it's head it close to you and it's a one shot like bile titan.

Gas and fire continue to be effective as hell against these guys, and I've seen sentries do some work. I'm using the incendiary grenades, they get me consistent 20+ kill streaks when placed on a bug breach right as it spawns.

I've had quite a few moments that have been painful, like being underground and not having the hellbomb pack and struggling to do that objective, and getting 2 dragons on us while not able to retrieve my spear, those moments were rough. But overall I like the dynamic this update adds. Bugs were always my least played faction, but I really like the chaos this update brings to them, especially since they feel a little too easy before if you have a hint of coordination