I have a 100 Ah Super Cycle AGM battery, which I am charging with a Smartsolar 100/20.
The guy from the store told me to use the Spiral Cell preset, which sets absorption to 14.7v.
I tried this out for a short term (i.e. < a couple of hours) as I could hear the battery bubbling furiously. I lowered to 14.4v, as it was right in the middle of the documented "cycle service normal" on the Victron datasheet... This also produced a bubbling (sounds aggressive when I put my ear to the side of the battery).
My understanding is "bubbling is bad - no bubbling is good - avoid bubbling"
I've since dropped back to 14v and no bubbling... This seems low though...
I recently bought a second super cycle battery, and immediately noticed that the one I had had for a couple of weeks, with which I had been changing the charge profiles on, was a little bulgy in comparison...