I would put Ambush just below refreshing the 3 stacks of ER/BS stacks since I basically never use it if my stacks are going to drop. Ambush would then be above our basic auto-attack (Rifle Shot) and extra Snipes until the rest of our skills are off cooldown.
Updated the OP:
- Shatter Shot Flourish Shot
- Covered Escape Hightail It
- Series of Shots* Speed Shot
- Orbital Strike* XS Freighter Flyby
- Plasma Probe* Incendiary Grenade
- Interrogation Probe Shock Charge
- Explosive Probe Sabotage Charge
- Corrosive Dart Vital Shot
- Maintaining 3 stacks of Electrified Railgun Blazing Speed NEW!
- Ambush Aimed Shot NEW!
- Snipe* Charged Burst*
- Overload Shot Quick Shot when repositioning to maintain 3x Electrified Railgun Blazing Speed stacks
Asterisks (*) on certain abilities because their usage will vary a lot depending on the circumstances and player preference. These abilities also comprise a big part of your DPS and are important to keep up or keep on cooldown.