It looks like something didn't work as intended - are you sure RSO is enabled and you have no trigger mods?
I was just testing it and with only RSO and infinite ores I seemed to get infinite patches inside normal ones properly.
I did misplace an option. bobsores had a make all ores infinite ...

I seem to have managed to forget or misplace an option. In 0.14 there were infinite patches in the middle of normal ore with RSO.
Now in 0.15 I seem to get only infinite ore. Did I miss something, and can I go back to how it was before?
EDiT: Or did I make a mistake and non infinite ores also have a ...