Edy
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Who knows Al , he did attract me to buy this brand with a very nice discount , i will try to do all the above , my main problem may be that i stay too much with flame and overheat my alloy , my thinking is if the alloy will be more liquid will flow better , this can be my mistake.If you think you are doing everything right and you have been using this metal for a long time with no problems till now than I would switch metal.
Could be a manufacturing problem they aren't telling you about. Maybe they lost one of their suppliers or have a bad batch.
They don't recall products they just let us think we are crazy. Sometimes its not our fault. We can go along for years with no problems then all the sudden problems for a month then they go away.
Maybe the material is great 99% of the time but dosent work 1% like large pontics.
I always used Rex 3 for NP for 20+ years and never saw porosity. Very forgiving except when I waxed under .3 thickness. It was so easy and very forgiving for technique inconsistencies.
Pd based Noble alloy on the other hand is sensitive to sprueing technique for suck backs and porosity and taking in gasses from casting.