Please excuse the hitching, recording on AMD GPU's is not a nice experience....... that's whats causing it.
Attaching gimbals and guns, choosing the right ones is key, the Put....Put....Put.....Put ones are not good for high shield capacity ships.
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What you need is some Pew....Pew....Pew.... and BRRRRRRRRRRRRRRRRRRRD. in this case a Gimballed Panther Repeater under the chin and a couple of Gimballed Mantis GT215's under the wings.
The cutlass is not too bad, the Mantis cannons makes Mince Meat of them pretty quickly, get rid of them first. The Valkyrie is a tough nut to crack, don't allow her to hit you more than once, she is fat and doesn't turn well but the 325A has good lateral thrusters, use them to stay out of the Valkery's firing ark, the Panther Repeater will slowly peck away at her shields, Don't relent, if you allow them to recharge you have to start again... once they are gone the armour is thin and the Mantis will slice up the hull.
Keep your eye on your shields, that's where the 325A is lacking, she also has paper wings, as you can see in the first video... when the shields get low get out of there and allow them to recharge before going back in.
PS: Changed the colour of my ship. Again! Pearl white this time, not sure i like it...