i just remembered ..
on one i put a pencil lead tip under the string to raise it a tiny bit.. this was on one in that area i believe the third fret. cured the problem. so then i used dan erlewines method of filling that nut slot slightly with shavings off the nut and super glue . and that worked very well too. that is if the nut slot is the actual problem
going to the 11s should make the string sit slightly higher if the slot is cut for 10s
but i think that will be temporary till the string wears it down some say from bending.