So basically if i understood everything correctly you did 11 single rolls first and got a gold + silvers and then did an 11x roll and got only bronze. And due to this you now think that single rolling is better?

No, it is not better, in fact you waste 5 flower gems by not doing an 11x roll. Just because you happened to be lucky with the single rolls does not mean the multi roll is bad. It's the same rates you just happened to be lucky/unlucky.