Sounds to me like the problem is that a 2:1 VSWR could be several possible combinations of capacitive, inductive, and resistive impedances and those have different effects...
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So maybe define the problem a little more clearly?? Do you want a purely resistive 2:1 VSWR of 100 ohms?? Or 25 ohms?? Or some kind of combination of resistive and reactive impedances?
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The most thorough test would probably include some testing with each condition but I don't know how much of a difference it would make.
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A tuner would let you modify inductive and capacitive reactance to get the VSWR you want
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Different value resistors would give you different resistive impedances.
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Not sure what the salt water dummy load would be but my hunch is that it would be resistive impedance.
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Does this sound right?
