Im having trouble identifying the correct Unicode characters for some Jawi letters. Can you help?
Sure. Use U+06A0 for Jawi nga, U+06BD for Jawi nya, U+0762 for Jawi ga, and U+06CF for Jawi vi. Note that U+0762 for ga takes the shaping of the Persian/Urdu gaf (= U+06AF), but with a dot above, instead of a line above the letter skeleton. The letter U+06AC (a kaf with a dot above) is also sometimes used for the Jawi ga, but is not the preferred representation.