Hi Carol
String sets are, as you`ve guessed referred to by the diameter of the thinnest e string - so yes, yours are 11s.
IMHO 9 or 10s are going to sound very thin on an acoustic guitar. They simply lack enough of the vibrating mass to "drive" the top of the guitar adequately.
There is a definite improvement in tone as string guage increases - I use 13`s on my acoustic.
Of course, heavier strings are harder to play and choosing them will depend bit on what you want to do with your playing. Bending strings will be harder the heavier you go, and it will take a bit more effort to hold down barre chords.
Will
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