You've gathered some good techniques, so here's another possibility.
Paint the prop the basic color, usually black. Once the paint is dry, I mask off each tip with a small rectangle of masking tape, making sure to adjust it so the yellow tip won't be crooked or slanted.
Then I mask each blade with strips wound down the blade toward the hub; or up from the hub toward the blade (either direction works)--like a mummy. I mask the hub with whatever it takes to protect it.
Then spray the tip area with more black paint. This seals the mask and avoids paint creeping under it.
Then I spray the tip with white, followed by yellow. The white base keeps the yellow on the tip bright.
Photos below--four props from a B-24.
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Usually works and no touch-up required; but sometimes. . .
And good luck with whatever method you try.