well, have a few things to say on this matter.
1) the term "dives" implies that your throw may have some torque in it and coupled with the archangel being one of the least predictable discs ever designed, this disc likely isn't the best choice in the long run for you. the "float" you talk about is caused by the arch's low speed overstability and isn't really a characteristic of any truly understable disc.
2) the only predictable turn characteristics come from discs in plastics with high air friction. dx, pro d, s, etc. as air friction decreases, the discs are less apt to respond. the cfr archangel is actually quite overstable. throwing a turnover shot is similar to throwing a curveball in baseball, a scuffed ball will curve more easily than a new ball, similarly a beat disc will turn more easily than a new one. elite x and pro plastic has more air friction than dx types. it will generally take 18 months or so to turn a z/champ plastic disc into a good turnover disc.
also, most roc throwers prefer rocs when they are super beat and plastic that makes rocs fly like new longer makes this more difficult. i will actually thrash my rocs before they ever see serious bag time.
3) depending upon a disc's flight characteristics when new is depending upon the shortest possible segment of a disc's lifespan. a very understable disc when new will be a roller when very broken in. a disc that begins stable and breaks in will become a turnover disc for a very long time before it becomes a roller. my dx eagles last approx 8-12 months before they become a turnover and ~18 months before they become rollers. my suggestion is to find a disc that flies straight to very slightly understable when new that you can break in to a turnover disc.
as for recommendations on discs.
the z xpress is pretty much stable when new and takes forever to break in to the point where it will predictably turn. the only predictably turning champ disc is probably the panther and that will become a roller after it breaks in and is not a distance disc.
i use beat up dx teebirds, dx valks, and d cyclones as my turnover discs. i used to use elite x xl's and broken in polaris ls's. discs like the dx cheetah, raven, dx orc, etc. are other examples of discs that will hold a good turn without rolling after they are broken in. imo, you are better off hoping your disc will hit a tree so that it will turn more rather than hoping your disc will not hit a tree so that it will turn too much.