If you are finding refinement is altering your resistance significantly, make sure the board is grounded properly. A bad ground can often cause resistance to drift. It matters more at refinement pulses because there isn't a whole lot of power being thrown around when the pulses are being done.
Alternatively, locking Ohms, as has been mentioned, will likely work, if the issue is ground.
SS is more finicky about this because its full temperature range is only a ~20% change in resistance. So 10% error from refinement on a low resistance coil can mean being a hundred degrees off. You can lessen the problem by making a higher resistance coil if you want.
I've noticed that just a one tenth increase in ohms from the cold setting makes the vape warmer. And since I've bedded this coil it has dropped that amount making it vape cooler. I'm have trouble seeing how I can get inside. The vt133 uses an odd pattern in its fasteners. I don't think an Allen wrench will fit 'cause it ain't hex.
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