If you won't be getting back from your morning dives until noon-1, then an afternoon 2-tanker will be difficult to find as most of them go out at around 1. But you might check with Dive Paradise, the onsite dive op at your hotel--they have an afternoon one-tank that goes out between 2-3pm and you can always shore dive as well. DP also does afternoon 2-tankers but again, I believe they leave around 1pm, which would conflict with your morning dives.
You might also check with Papa Hogs--they have boats that go out morning and afternoon, although I'm not sure what time the afternoon boats leave. They will pick up at your hotel's pier.
Oh and Christi with Blue XTSea can arrange afternoon dives as well--I"m diving with her Thanksgiving week. She is very flexible in arranging dives and can accommodate various experience levels. She will pick up at Brisas' pier....oh excuse me, Magic Sunset's pier.
And I think "Magic Sunset" sounds more like a brothel or a "ride at 6 Flags", if you know what I mean *wink*....LOL