[ACE-OF-ACES]

I think what you assert rather depends on whether you use the report that ACE has used or the other, later report performed at a take-off weight of 7400lbs rather than the 7234lbs in the earlier report, and which take-off weight the game assumes for the SpitIX25lbs.
The other report

S! Grunch

I used this test because the in-game Spitfire IX 25lb shows a Takeoff Weight of 7,116lb

Here is the link

Spitfire IX FM Analysis

So I though the heavier one would not be a good fit, but to be honest I did not look at the other test (7,400lb) too much.

Which one do you think would be the best to comp to?

Because I can re do it pretty quick

Just need to know the why so that Ill know if someone asks!

PS thanks for double checking all this

Because it can be confusing so I do thank you for checking!

The goal is to comp to the plane that is most like the ingame plane

In that you would be hard pressed to find real world data that matches an ingame plane perfectly