I totally agree,yellow and orange pretty much suck at giving good coverage. I've gotten pretty decent coverage with HF Yellow when I sprayed it on but I don't use use H powders anymore. Eastwood Lime Green or Med. Green cover very well I also like Smoke Yellow Green or his Carolina Blue or Signal Blue. I've become really partial to the clear coating as of late, I like the Silver Vain,price is right on a lb. as well.
Some Lee 125 gr. RF I did with Smokes Yellow Green with a pinch of HF Yellow added.