OK. Glad to hear things are improving.
The voltage drop that you are seeing is characteristic of a 2xxx series anodization curve. 7xxx series does this too, but not as pronounced. 6xxx and 1xxx series have a curve that slopes up, and the coating forms much faster.
You don't want the bath temp. to get much higher than that, you should be thinking about some sort of temperature control.
That isn't hydrogen that you are breathing, hydrogen is ordorless, colorless and tasteless. The small amount of hydrogen generated escapes quickly (its the lightest element) and isn't any sort of hazard. You are breathing sulfuric acid fumes, the ventilation where you are anodizing isn't adequate. You will want to fix that fast.
Mist suppressant and balls will certainly help, but you do need good ventilation.
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