It still sounds like the beadblasting is contaminating the work, most likely with oil. If this is the case, the oil has been blasted into the now rough surface of the work, its in deep. I doubt simple green, alkaline, or whatever will take it off easily. Elevated temperature and vigorous scrubbing would be in order.
The oil/moisture trap that came with my compressor was an ineffective POS, I replaced it.
Since radiator shops aren't noted for their oil-free environment, get your own glass beads from MSC or where ever, you then will know that they're clean. Your blasting cabinet and the gun have to be clean too, are they?
I'm also assuming you haven't changed anything else besides adding the beadblasting.
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