congrats, Kawei. The yellow can't be improved on but the red is definitely moddable - here are just two examples - 1 neg 1 positive. it should be noted that the HT-4 is more of a maroon red and not very bright -quite dull actually, which makes it pop more with the white positive PANDA.
combined with GD-X6900CS-7
combined with GD-X6900-7