Put shards + hotshot maybe for higher lvl/lvl cap I guess....

This stuff works all right, didn't meet any problems yet.

You just press 4 and then mousewheel, that's it

Also press 2 sometimes for more shield.

Keep 3 active if you like it, it's okay but maybe not always necessary :D

Don't replace your 1 or 2 ability with Helminth. If you replace your first ability, go uninstall the game aswell. If you replace your second ability, replace it with Rebuild Shields if you still want to stay with this build, or a very similar one.
If you find your 3.rd ability nice and cool at all, better not replace it aswell, but this ability you can absolutely replace if you want really, I really don't give a phuck. There are "[Saryn]'s Molt" you can use when 4.th ability is active, and also you should then change your augment mod to one like [Ice Spring], [Toxic Flight], or [Firewalker].
I really don't recommend changing your 4.th ability to anything, but some would change it to Xata's whisper. Roar wont do anything so it's useless.

You need this: https://overframe.gg/build/914177/