Re: amps / sq. in.
By 'chalky', could it also be described as 'cloudy'?
When I'm anodizing, I get bubbles that form on the cathodes and get swirled by the agitation. When I'm doing larger surface areas, it gets going so good that you can't see very far into the tank, then begins to clear when I've removed power.
If that's what you're seeing, it's nothing to worry about - actually I like seeing it, tells me lotsa stuff happnin. In reality I don't think it's terribly conclusive, I've done many runs that don't look very active but dye just as well.
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