Type 6 Boost speed is...?

Type 6 fan and I have a question about its maximum boost speed.
Per the Corolis site and ED Shipyard my 6 should have a boost speed of 405 m/s in its current configuration - basically "A" engine, power distributor, and thrusters - with 4 pips to the engine yet, unloaded or loaded with cargo, I can only get 385'ish. Had another player try it and it is the same for him.

What is the issue or what am I missing?
Thanks in advance.
 
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