RDA
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Overnight is unusable, I use only fast burnout and ringless. The problem, it does not sat completely in the ring. To the point it sometimes is so soft I could not even remove it from the ring without braking it! Have not tried Microstar HS. I heard mix reviews about it.
I have used Fujivest II for years with a fast burnout. We let it set for twenty minutes minimum before placing in the furnace, and it works out great.
I also use it for at least 15 years. Very inexpensive and good when it is working.... I am one man lab, and always use timer, I also weigh it on the electronic scales, the bags are always have more than 90 grams by few grams. Have You switched to something else? I use 45SF alloy 45 gold 45 palladium. But I also use it for all other C&B use. Like gold crowns and custom abutments.
If you are still use UCLA what investment do you use. The problem with FugivestII when I use it for my custom abatements is micro fins and babbles close to base/platgorm of abatement, and the gold would overflow to the platform, especially if it is closer than 1mm to it. I do make sure the platform is wax free. I clean it with GC Resin monomer and alcohol. Nevertheless I still get gold on the platform. Very annoying! I use broken arm casting machine. I make sure I don't over tight it also. I blame the investment at this point.
For cast custom abutments, what cleared up this fins and overcast for me was, venting the wax up at the base close to the interface, and also placing the ring in a pressure pot. The casting comes out very clean with a full cast to the base with this method.