That's what I did too. Notice the sliders are near the extremes to get 1360 and 230.
Next time around though I think I'll use a 1.5K and 250 ohm fixed and parallel them with resistors to get the exact value. Fixed are half the cost of the adjustable ones.
15K in parallel with the 1.5K
2.7K in parallel with the 250
2W should be enough. Most of the current will be running through the big power resistor.
