Try trimming the elevator for a known speed during your before-takeoff check. The 1940 ops manual directs the trim to be set one unit AND (Aircraft nose down). Try this and then leave the trim alone... your airspeed will settle down around 185-205 with the radiator shutter at half open after 185 MPH. This is close to your "Comfortable" rate of climb. (Comfortable is not defined, but I assume it's the Vice Air Marshall's favorite speed.)
As a personal preference, you might consider an AND setting of 1.5 units (also called divisions) on the gauge instead. This will reduce the climb rate but will increase airspeed acceleration until it stabilizes near 244 MPH. This is a useful speed called "Cornering" velocity and provides the maximum turn rate while preventing over-stress with full stick deflection. In other words, if you get bounced at 244 MPH, you can react instinctively with aggressive back pressure without ripping the wings off.
Rudder trim is useful primarily in non-maneuvering flight to make the plane fly straight. In a dogfight, we need to learn the instinctive foot pedal inputs associated with airspeed changes. Forces change so quickly that rudder trim simply confuses your muscle memory's "Center point", and you'll soon need regular rudder input anyway.
Generally, if you start a dive you will accelerate, requiring left rudder to center the slip indicator. Conversely, you need to add right rudder to compensate for the deceleration encountered in a climb. This is part of lesson One when learning to fly a light, single-engine airplane but is easy to forget if you don't make it a habit. This subject is much more complicated with lots of technical terms [P-Factor, Torque, etc] to explain it but this statement simplifies the discussion for practical learning.
To practice rudder inputs, simply perform 1000 FPM climbs and descents with a constant power setting:
At 5000' AGL, pick a distant point to aim at, and set 2500 RPM and 2.5 psi manifold pressure boost to stabilize level flight at 250 MPH. (Varies slightly with different Spitfires) Center the rudder trim at these settings. You are now "Trimmed" for 250 MPH.
Leave the trim alone and start a 1000 FPM descent with forward stick pressure. You'll see that you need left rudder to center the slip indicator as the plane speeds up. Don't trim, so that your mind will learn to associate stick forward pressure with left rudder pressure. When you're tired of descending, start a gentle pull up into a 1000 FPM climb. You'll find the need for right rudder to be intuitively obvious.
Once you get the physics figured out, challenge yourself and make the changes from climb to descent more quickly and with greater frequency to develop that "Pull Up - Right Rudder / Push Forward - Left Rudder" instinct, all while keeping the slip-ometer centered. It ain't easy!
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