Oh, 0.3 rsense is rather big, i think there are like two caveats you should watch for, one the voltage across rsense has to be less than 0.5v, and another is vref(max) should be less than 4v when microstepping. Not sure of the last one, probably should check datasheet. With 1.5a setting both these limits seem pretty close. I think this makes 1.5a sort of the max usable setting. You could change rsense resistors, especially if they seem to heat too much, but even if so, this chip probably wont give any significant setting increase. Hopefully the 0.3 resistors are at least 1w, perhaps better if are 2+w (++bigger package than typical 1206 smd).
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