200%ish Strength is enough since high level enemy will one shot you anyway, focus a bit on Range and some Duration for the Shock Reservoir to keep the enemies electrified and keeping you and your Squad alive (yes this ability is OP).

Recommended Weapon against Demolyst is [Redeemer Prime], but feel free to try every weapon.

Place Reservoirs carefully, make sure to place it in a spot easier for your Squad to see while not on the path of the demolyst as they can nullify your Reservoirs.

when you have reached wave that could potentially oneshot you (12 above) stay in the air by bunny hopping or pressing her 2nd ability to stay invisible, and in case of stray bullet kills you then it will trigger [Quick Thinking].

Exilus Slot is your preference.