If I leave drops of water on an anodised and dyed part (before sealing) then I find that the dye leaches out leaving lighter stains where the droplets were. Obviously your problem is the dye leaching out before the pores manage to seal over.
I suppose an easy solution would be to get some commercial sealer. This is what I use and I've never had a problem with dye leaching out during the sealing process.
If you want to save pennies then maybe try some other things. If you are currently adding the dyed parts to boiling water then there is no way to increase the heat (which is what causes the pores to seal) so what you would probably have to do is decrease the leaching effect - Steaming might work - usually this would take a little longer - about 30 mins to seal the pores over.
Past that I think you would need to look at the size of the pores - large pores might cause the dye to take well but also leach out well. This would be to do with your current density but from my calculations you have a current density of 4.3A/sqft which should be fine. There may however be something I am missing nere which a more experienced anodiser might be able to point out.
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