What u have there is great, and is definitely in the key of F#/Gb. As a matter of fact, I actually played these chords today in a service. I would add this to it to make it flow a little better and also to make it a neverending progression (sort of).
Key Gb LH/RH
Ab-Eb / Gb-Cb-Db-Gb
Gb-Db / Ab-Bb-Db-Gb
Fb / Ab-Cb-Db-Gb
F / Ab-Db-F
Eb / Db-F-Ab
(repeat)
same thing written in F#
G#-D# / F#-B-C#-F#
F#-C# / G#-A#-C#-F#
E / G#-B-C#-F#
E# / G#-C#-E#
D# / C#-E#-G#
(repeat)