I had the following reply, after I'd posted more accurate data in another forum after using SkySafari to recreate the field of view. The SkySafari plot showed that they appeared at about 35° altitude and tracked directly down to about 18° altitude. Azimuth about 010°
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According to (approximate) calculations for that date from your location, Iridium 114 would have been at 36° elevation, 14° azimuth at 10:57 UTC and dropping to 22° elevation, 11° azimuth a minute later -- matching your observations. Many of the other Iridium Next satellites would have been nearby.
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I'd say that's fairly conclusive that it's what we saw.
And Dean, from your link, that they are half as high again as the ISS would explain their relatively slow movement (compared to the ISS).
Thanks