maybe another method would be usefull.
i removed the required photos from my picasa program on laptop.
this has the advantage of being able to chose the shots,and is easy
to do via the normal menu.
then return to the nexus,and,as above,stop both gallery and g+ then
cancel data,and cache on both. now switch off phone.after short
period restart, nexus will run photo data update,but without the deleted
pics.worked well for me..on uk gsm nexi.