The guides fast cast set seems pretty up to date. The only thing It's missing I could think of are mostly the latest high tier mission battle field drops:
Cath Palug Hammer (7% FC) instead of Sucellus (5%) [I think you can't augment that thing?]
Malignance earring (4% FC) replacing either of the two options mentioned (2% FC)
Alternative to the adoulin (Weatherspoon ring / Weatherspoon ring +1) and voracious resurgance (Medada's ring) reward rings are Lebeche Ring for quick magic or Prolix Ring for 2% FC.
Could also go for augmented Fi Follet Cape +1 (10% FC) if you don't want to do a dedicated ambu cape.
Interesting enough the shield option mentioned in the guide isn't listed on
BG wikis fast cast page, always had the suspicion those lists aren't complete.