The lower res isn't so much a concern as the wire's tcr value, it's lower than it should be, that's why you have to lock the res at a higher value. Essentially you're just tricking the mod into thinking it has to reach a higher tfr value to reach your set temp. As you suspected raising the tcr value in escribe will fix the problem (for that particular wire).
There is another test that can be used for setting tcr that works, the dry cotton browning test. It works the same as the water boiling test and some prefer it over the water boiling test because it is performed at 420°f instead of 212°f ie at a closer temp to our normal vaping temps.
Dry Cotton Browning Test:
Dryburn and rewick with new cotton, set temp to 420°f with plenty of power, fire the mod for approx 5 sec, check wick for very slight light brown discoloration, adjust tcr as necessary.
Tip: Use a long piece of wicking so that it can be slid over after each test fire. This is most helpful if the tcr is too high and is burning the wick.
ETA: Just so I don't forget I annotate the approx tcr value on the wire spool. I have spools of SS430 with tcr values ranging from .00120 to .00146 written on them, so it can be way off.
EETA: I almost forgot! Don't use claptons or any type of multistrand coils for your tcr test. Use single strand wire slightly spaced coils for your tests as this increases the likelihood of establishing a solid connection at the post screws and eliminates the chance of having hotspots.
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