[morzh]

well, I would not touch the resistor, if it is what is specified. As for the winding, same gauge at same turns and same coil diameter shoud've given you the same resistance. There's something amiss. But , if it is indeed lower resistance and you are sure the number of turns is correct, the possibly larger gauge reponsible for it won't do anything bad, as your inductance will stay the same, your skin losses will become smaller, and yor DC resistance does not really matter.

Again, don't change the 15K resistor.
And, make sure you DID count the turns right.